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Ingredients

• 2 cups all-purpose flour
• ½ cup unsweetened cocoa powder
• ¼ cup (packed) brown sugar
• 2 teaspoons baking powder
• 1 teaspoon baking soda
• 1 teaspoon kosher salt
• 3 large eggs, separated
• 2 cups buttermilk
• ½ cup olive oil
• 1 teaspoon vanilla extract
• 6 oz. bittersweet chocolate (at least 70% cacao), finely chopped
• Nonstick vegetable oil spray
• Unsalted butter
• Warm pure maple syrup
• Peanut butter