One-Bowl Chocolate Zucchini Bread

This one-bowl chocolate zucchini bread is rich, fudgy, and so easy you’ll make it on repeat. Shredded zucchini melts right into the batter, keeping every slice tender without a hint of vegetable flavor.

It’s my go-to when I need a quick chocolate fix that still feels like a real loaf, not a cake. No mixer, no waiting for butter to soften, just a whisk and a bowl.

Why This Loaf Stays in the Rotation

The crumb is deeply chocolatey, almost like brownies, thanks to cocoa plus plenty of chocolate chips. A full cup of shredded zucchini makes every slice tender but you’d never know it’s there.

It comes together in one bowl, so cleanup is fast. I keep coming back to it because it bakes up reliably, stays soft for days, and freezes like a dream.

Ingredients

• 1 1/2 cups all-purpose flour: spooned and leveled
• 1/2 cup unsweetened cocoa powder: Dutch-process gives deeper color and flavor
• 1 tsp baking soda
• 1/2 tsp baking powder
• 1/2 tsp fine sea salt
• 1 cup granulated sugar
• 1/2 cup vegetable oil: or any neutral oil
• 2 large eggs, at room temperature
• 1 tsp vanilla extract
• 1 1/2 cups shredded zucchini: about 1 medium zucchini, squeezed to remove excess moisture
• 1/2 cup buttermilk: shaken; see note for homemade
• 1 cup semisweet chocolate chips: plus a few extra for topping

Variations / Substitutions

• Swap the chocolate chips: use white, dark, or even peanut butter chips for a different twist.
• Make it dairy-free: use a neutral oil and dairy-free milk with a teaspoon of vinegar instead of buttermilk.
• Swap the sugar: use coconut sugar or a cup-for-cup sugar substitute for a lower-glycemic version; the loaf may be slightly less tender.
• Add spice: a teaspoon of cinnamon or a pinch of espresso powder deepens the chocolate.

If you have extra zucchini, my zucchini muffins are another favorite.

How to Make Chocolate Zucchini Bread

Step 1: Whisk the Wet Ingredients

Preheat your oven to 350°F (175°C) and grease a 9×5-inch loaf pan. In a large bowl, whisk the 1/2 cup oil, 1 cup sugar, 2 eggs, and 1 teaspoon vanilla until smooth and glossy, about 1 minute.

The mixture will look thick and emulsified, no streaks of oil. This bit of whisking aerates the eggs, which helps the loaf rise.

Step 2: Stir in the Dry Ingredients

Add the 1 1/2 cups flour, 1/2 cup cocoa powder, 1 teaspoon baking soda, 1/2 teaspoon baking powder, and 1/2 teaspoon salt right on top of the wet mixture. Stir until just combined, about 30 seconds, with a few streaks of flour still visible.

The batter will be thick and dark. Overmixing here makes the bread tough, so stop as soon as the flour disappears.

Step 3: Fold in the Zucchini and Chocolate Chips

Squeeze the 1 1/2 cups shredded zucchini firmly over the sink to remove excess water, then fold it into the batter along with the 1 cup chocolate chips. The zucchini will add moisture, so don’t worry if the batter seems thick now, just fold until evenly distributed, about 20 seconds.

The batter will be speckled with green and chocolate, and it will loosen slightly as the zucchini releases its liquid.

Step 4: Bake and Cool the Loaf

Scrape the batter into the prepared pan, smooth the top, and scatter a few extra chocolate chips on top. Bake for 55 to 65 minutes, until a toothpick inserted in the center comes out with a few moist crumbs but no wet batter.

The loaf will be domed and cracked on top, and your kitchen will smell like brownies. Let it cool in the pan for 10 minutes, then turn it out onto a wire rack to cool completely before slicing. Slice and serve, and you’ll see a deep chocolate crumb with melty chocolate chips.

Tips for the Best Chocolate Zucchini Bread

• Use a kitchen scale if you have one, it’s the most accurate way to measure flour and zucchini and avoids a dense loaf.
• Squeeze the zucchini firmly but not bone-dry; a little moisture helps the crumb stay tender.
• For the deepest chocolate flavor, use Dutch-process cocoa and a pinch of espresso powder (even if you don’t taste coffee).
• If your loaf is browning too quickly on top, tent it loosely with foil after about 40 minutes.
• This bread tastes even better the next day, so it’s perfect for making ahead.

Bake times by pan:

Storing and Freezing

• Refrigerate: wrap tightly and store in the fridge for up to 5 days; it gets fudgier when cold.
• Freeze: wrap the cooled loaf or slices in plastic wrap then foil, and freeze for up to 3 months. Thaw overnight in the fridge.
• Reheating: a quick 10-second zap in the microwave revives the gooey chocolate chips, or warm slices in a toaster oven for a crisp edge.

What to Serve with Chocolate Zucchini Bread

A warm slice with a pat of salted butter is hard to beat; the salt plays off the chocolate. For dessert, a scoop of vanilla ice cream or a drizzle of caramel sauce makes it feel special. And a mug of strong coffee cuts the richness perfectly.

Frequently Asked Questions

Can I make this gluten-free?

Yes, use a 1:1 gluten-free baking blend that contains xanthan gum. The loaf will be just as tender.

Do I need to peel the zucchini?

No, the skin is thin and disappears into the batter. Just give it a good wash before shredding.

Can I use coconut oil instead of vegetable oil?

Melted coconut oil works, but unrefined will add a coconut note. Use refined coconut oil for a neutral taste.

Why did my loaf sink in the middle?

It’s usually underbaked. Make sure the toothpick test comes out clean, and avoid opening the oven door too early.

Can I reduce the sugar?

You can drop it to 3/4 cup, but the texture will be slightly less tender and the chocolate flavor less round. I wouldn’t go lower.