Ingredients:
- 1/2 cup unsalted butter at room temperature
- 2 cups all purpose flour
- 1/2 cup unsweetened cocoa powder
- 1 teaspoon baking soda
- 1/2 teaspoon baking powder
- 1/2 teaspoon salt
- 1 cup (packed) light brown sugar
- 4 tablespoons white sugar
- 1 teaspoon pure vanilla extract
- 1 teaspoon instant coffee granules
- 2 large eggs
- 1 cup unpeeled grated zucchini
- 1 large overripe banana (mashed)
- 1 cup bittersweet chocolate chips
- Confectioner's sugar (for sprinkling on the top)- optional