Zucchini Hazelnut Chocolate Chip Cake

I remember the first time I tried a zucchini cake that promised moistness and chocolate but turned out too dense and a little bland—so I tested and adjusted until the zucchini hazelnut chocolate chip cake truly sang. This recipe for zucchini hazelnut chocolate chip cake balances moisture and lift, keeps the hazelnuts flavorful, and gives dependable timing for busy families who want a homemade dessert that isn’t fussy.

Why this zucchini hazelnut chocolate chip cake works

The key technique is controlling zucchini moisture and waking up the hazelnuts. Grated zucchini can water down a batter, so I grate it, let it sit briefly, then squeeze out the excess—this keeps the cake tender but not gummy. Toasting and roughly pulsing the hazelnuts before folding them into batter gives a fresh toasted flavor and a pleasant crunch that survives baking. I also use a moderate amount of oil plus an extra egg white to keep the crumb soft without weighing it down. The chocolate chips add pockets of melting sweetness while the hazelnuts add texture and a toasty note that pairs well with the mild zucchini.

During testing I first tried a version with very finely shredded zucchini and whole toasted nuts; the center stayed too wet and the nuts disappeared into the crumb. What made the difference was coarser grating and squeezing the zucchini, and chopping the nuts so they distribute evenly. A final sweep through the oven at 350°F for the prescribed time produced a golden domed top with a springy center and visible nut flecks.

Key takeaways

• Squeeze grated zucchini to control moisture—this prevents a soggy center.
• Lightly toast and pulse hazelnuts for brighter nut flavor and lasting crunch.
• Use a mix of oil and an extra egg white for tender, not dense, crumb.

Ingredients you’ll need and what to substitute

This cake uses pantry basics plus fresh zucchini and hazelnuts. I prefer mild vegetable oil (canola or neutral olive oil) because it keeps the crumb tender and stores well. You can substitute melted unsalted butter for the oil for a richer flavor; reduce the oven time by 3–5 minutes if you use butter because butter-based batters brown faster. Use light brown sugar for a subtle caramel note—if you only have granulated sugar, add 1 tablespoon of molasses or maple syrup to mimic that depth. For chocolate, semisweet chips are versatile; use dark chips if you prefer less sweetness. If toasted hazelnuts are hard to find, raw hazelnuts work—toast them in a skillet or in the oven before chopping.

Important measurement notes: when I say 2 cups grated zucchini, that means packed into a measuring cup after grating. The zucchini should be squeezed lightly until it stops dripping freely—too dry and the cake loses tenderness, too wet and it sinks.

Equipment

You don’t need anything fancy. I used a 9×5-inch loaf pan for a family-sized cake that slices well; an 8-inch square pan can work with a slightly shorter bake time. A box grater or the large hole of a food processor grater makes quick work of zucchini. A mixing bowl, whisk, rubber spatula, and an instant-read thermometer (optional) are helpful. If you have a stand or hand mixer, it speeds creaming but isn’t required.

• 9×5-inch loaf pan
• Box grater or food-processor grating disk
• Medium mixing bowl and spatula
• Instant-read thermometer (optional)

How to make zucchini hazelnut chocolate chip cake

Prepare the zucchini and nuts

Start by preheating the oven to 350°F and lining a 9×5-inch loaf pan with parchment, leaving an overhang for easy lifting. Grate 2 medium zucchinis on the large holes of a box grater; you should have about 2 cups packed. Place the grated zucchini in a clean kitchen towel or several layers of paper towels, gather the edges, and squeeze firmly until the zucchini stops releasing free liquid. Set the squeezed zucchini aside. Meanwhile, spread 1 cup (about 5 ounces) of hazelnuts on a small baking sheet and toast in the oven for 8–10 minutes until fragrant and lightly brown; let them cool, then pulse 6–8 quick pulses in a food processor or roughly chop on a cutting board so you retain some chunkiness.

Make the batter

In a medium bowl whisk together 1 3/4 cups all-purpose flour, 1 teaspoon baking soda, 1 teaspoon baking powder, 1/2 teaspoon fine salt, and 1 teaspoon ground cinnamon. In a large bowl combine 3/4 cup light brown sugar (packed) and 1/2 cup granulated sugar with 1/2 cup neutral oil until evenly mixed. Add 2 large eggs plus 1 egg white, whisking until smooth, then stir in 1 teaspoon vanilla extract. Fold the dry ingredients into the wet in two additions, mixing until just combined. Carefully fold in the squeezed zucchini, 3/4 cup semisweet chocolate chips, and the pulsed hazelnuts, saving a small handful to sprinkle on top. The batter should be thick but scoopable; if it seems very stiff, stir in 1–2 tablespoons milk.

Bake and finish

Spoon the batter into the prepared loaf pan and smooth the top. Sprinkle the reserved hazelnuts and a few extra chocolate chips on the surface for a friendly presentation. Bake at 350°F for 48–55 minutes, checking at minute 45; the cake is done when a toothpick inserted near the center comes out with a few moist crumbs but not wet batter, and the top springs back when gently pressed. If the top browns too quickly, tent with foil for the last 10–15 minutes. Let the cake cool in the pan for 15 minutes, then use the parchment overhang to lift it to a wire rack and cool another 45 minutes before slicing. The cake smells toasty and warmly spiced; slices show flecks of green zucchini, brown nuts, and melted chocolate pockets.

Things I learned the hard way

• Don’t skip squeezing the zucchini—left un-squeezed it made the first cake I tested sink in the middle. The fix was to squeeze and reduce the baking soda by a quarter teaspoon to avoid over-rise and collapse.
• Chopping hazelnuts too fine made them disappear flavor-wise; rough pulses keep texture while releasing aroma.
• If the batter is over-mixed when adding flour, the crumb becomes tough—stir only until just combined.
• Using butter instead of oil made a richer cake but increased browning; reduce oven time slightly and tent with foil if needed.
• Test doneness with a toothpick and by touch—the center should be springy, not wobbly, to avoid an underbaked middle.

Variations to try

Chocolate-hazelnut swirl: Melt 1/4 cup chocolate-hazelnut spread and dollop into the batter after pouring into the pan, swirl with a knife, and bake as directed; this increases richness and may add 3–5 minutes baking time.

Lemon-zucchini twist: Add 1 tablespoon lemon zest and swap semisweet chips for white chocolate; reduce cinnamon to 1/2 teaspoon for a brighter profile.

Gluten-free option: Replace the flour with a 1:1 gluten-free baking blend and add 1/4 teaspoon xanthan gum if the blend lacks it; baking time may be 3–6 minutes longer.

Nut-free: Replace hazelnuts with toasted pumpkin seeds and increase chocolate chips to 1 cup; the texture is similar but with a different crunch.

Storage, freezing, and reheating

Store at room temperature for up to 2 days in an airtight container, or refrigerate for up to 5 days—bring slices to room temperature before serving for best texture. For freezing, wrap the cooled whole loaf tightly in plastic wrap and foil, or slice and freeze individual slices in single layers separated with parchment; frozen cake keeps well for up to 3 months. Thaw overnight in the refrigerator or at room temperature for a few hours. To refresh refrigerated slices, warm in a 325°F oven for 8–12 minutes or microwave a single slice for 20–30 seconds until just warm; avoid overheating to prevent drying.

What to serve with zucchini hazelnut chocolate chip cake

• Simple whipped cream or mascarpone to balance sweetness
• A scoop of vanilla ice cream for an after-dinner treat
• Fresh berries and a hot cup of coffee for weekend brunch
• Sliced apples and a mild cheddar for a casual snack plate

Zucchini Hazelnut Chocolate Chip Cake

A moist, tender zucchini cake studded with toasted hazelnuts and chocolate chips—simple prep, dependable timing, and family-friendly slices.

Print Recipe Pin Recipe

Prep Time 20 minutes mins

Cook Time 50 minutes mins

Total Time 1 hour hr 25 minutes mins

Servings: 10 slices

Calories: 320

Ingredients Equipment Method Notes

Ingredients

  

• 2 cups grated zucchini about 2 medium zucchinis, squeezed of excess moisture
• 1 cup hazelnuts toasted and roughly chopped/pulsed
• 1 3/4 cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon baking powder
• 1/2 teaspoon fine salt
• 1 teaspoon ground cinnamon
• 3/4 cup light brown sugar packed
• 1/2 cup granulated sugar
• 1/2 cup neutral oil canola or light olive oil
• 2 large eggs plus 1 egg white
• 1 teaspoon vanilla extract
• 3/4 cup semisweet chocolate chips divided

Optional topping

• 2 tablespoons coarse chopped hazelnuts optional, for top

Equipment

• 1 9×5-inch loaf pan
• 1 Box grater or food-processor grating disk
• 1 Medium mixing bowl and rubber spatula
• 1 Wire rack

Method

 

1. Preheat and toast nuts: Preheat the oven to 350°F and line a 9×5-inch loaf pan with parchment leaving an overhang. Spread 1 cup hazelnuts on a baking sheet and toast in the oven for 8–10 minutes until fragrant; cool, then pulse or roughly chop and reserve.
2. Grate and squeeze zucchini: Grate 2 medium zucchinis on the large holes, place grated zucchini in a clean towel or paper towels, gather edges, and squeeze firmly until the free liquid stops; measure 2 cups packed and set aside.
3. Mix dry ingredients: In a medium bowl whisk together 1 3/4 cups all-purpose flour, 1 teaspoon baking soda, 1 teaspoon baking powder, 1/2 teaspoon fine salt, and 1 teaspoon ground cinnamon.
4. Mix wet ingredients: In a large bowl combine 3/4 cup packed light brown sugar and 1/2 cup granulated sugar with 1/2 cup neutral oil; whisk in 2 large eggs and 1 egg white until smooth, then stir in 1 teaspoon vanilla extract.
5. Combine batter: Fold the dry ingredients into the wet in two additions until just combined. Fold in the squeezed zucchini, 1/2 cup chopped hazelnuts, and 3/4 cup semisweet chocolate chips, reserving a few nuts and chips for the top. If the batter seems very stiff, stir in 1–2 tablespoons milk to loosen.
6. Fill pan and top: Spoon the batter into the prepared loaf pan, smooth the top, and sprinkle the reserved hazelnuts and a few extra chocolate chips over the surface.
7. Bake and test for doneness: Bake at 350°F for 48–55 minutes, checking at 45 minutes; the cake is done when a toothpick inserted near the center comes out with a few moist crumbs and the top springs back when pressed. Tent with foil for the last 10–15 minutes if the top browns too quickly.
8. Cool before slicing: Cool the cake in the pan for 15 minutes, then lift it out using the parchment overhang and cool on a wire rack for about 45 minutes before slicing.

Notes

Squeeze grated zucchini thoroughly to avoid a soggy center; if substituting melted butter for oil, reduce bake time slightly and watch for faster browning. To freeze, wrap a cooled whole loaf tightly or freeze individual slices separated with parchment for up to 3 months.

Frequently asked questions

Can I use frozen grated zucchini? Yes—thaw it fully and squeeze out excess liquid before measuring 2 cups; frozen zucchini tends to be wetter so extra squeezing is important.

Do I have to toast the hazelnuts? Toasting isn’t strictly required but it significantly improves flavor; you can toast in a skillet over medium heat for 6–8 minutes or in the oven for 8–10 minutes at 350°F.

Why did my cake sink in the middle? Too much moisture from un-squeezed zucchini, overbeating the batter, or opening the oven early can cause sinking; squeeze the zucchini, mix gently, and avoid opening the oven until close to the end of the bake time.

Can I double the recipe? Yes—bake doubled batter in two loaf pans or a 9×13-inch pan (adjust baking time; a 9×13 will take 35–45 minutes). Two loaf pans keep timing close to the original recipe.

How can I tell when the cake is done? Use a toothpick near the center—aim for a few moist crumbs, not raw batter, and the surface should spring back lightly when pressed.

Closing

This zucchini hazelnut chocolate chip cake keeps well, slices cleanly, and tastes like the kind of dessert I want on a family table—textured, lightly spiced, and reliably moist thanks to the moisture control and toasted nuts. I hope it becomes one of your go-to cakes when you want something homemade without fuss.