1-Preheat your oven to 350°F. Grease two 9-inch cake pans, line with parchment paper, and grease the parchment. This preparation ensures your cakes will release easily after baking.

2-Whisk together flour, cocoa powder, baking soda, baking powder, espresso powder (if using), and salt in a large bowl. The espresso powder may seem optional, but I highly recommend it as it intensifies the chocolate flavor without making the cake taste like coffee.

3-In another bowl, beat together oil, granulated sugar, brown sugar, eggs, sour cream or yogurt, and vanilla until smooth. The combination of granulated and brown sugars creates the perfect balance of sweetness with subtle caramel notes.

4-Add shredded zucchini to the wet ingredients and mix to incorporate. You might notice the batter appear green briefly don’t worry, this completely disappears during baking!

5-Gradually combine wet and dry ingredients, mixing just until no dry streaks remain. Be careful not to overmix, as this can develop gluten and make the cake tough instead of tender.

6-Fold in chocolate chips, distributing them evenly throughout the batter. I prefer mini chips as they distribute more evenly, but regular chips work wonderfully too.

7-Pour batter evenly into prepared pans and smooth the tops with a spatula.

8-Bake for 28 32 minutes, or until a toothpick inserted into the center comes out clean or with just a few moist crumbs attached.

9-Allow cakes to cool in pans for 1 hour, then transfer to a wire rack to cool completely. Cooling is crucial the cakes need to be completely cool before frosting to prevent the buttercream from melting.

10-Beat butter in a large bowl until creamy, about 2 minutes on medium-high speed.

11-Gradually add confectioners’ sugar and cocoa powder while mixing on low speed to prevent a powder cloud in your kitchen.

12-Add heavy cream (starting with 3 tablespoons), salt, and vanilla extract. Increase speed to medium-high and beat until smooth and fluffy.

13-Check consistency: if too thick, add additional cream 1 teaspoon at a time; if too thin, add more powdered sugar. The perfect buttercream should be spreadable but hold its shape.

14-Once cakes are completely cooled, use a serrated knife to slice off any domed tops to create a flat surface. This step ensures your final cake has straight, professional-looking layers.

15-Place one layer on a cake stand or plate. Spread a layer of frosting over the top.

16-Place the second layer on top. Frost the top and sides of the entire cake, applying a thin crumb coat first, chilling for 15 minutes, and then applying the final layer of frosting for a pristine finish.

17-Decorate with chocolate chips and/or sprinkles if desired. For a more elegant look, chocolate shavings or curls make a stunning topping.