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Step 1: Prepare Your Equipment
• Preheat your oven to 350°F (175°C).
• Grease and flour two 9-inch round cake pans or line them with parchment paper for easy removal.
Step 2: Cream Butter and Sugar
• In a large mixing bowl, beat softened butter and granulated sugar until light and fluffy. This incorporates air into the batter, ensuring a tender crumb.
• Add the vegetable oil and mix until fully combined.
Step 3: Add Wet Ingredients
• Beat in the eggs one at a time, followed by the vanilla extract and white vinegar.
Step 4: Combine Dry Ingredients
• In a separate bowl, sift together the flour, black cocoa powder, unsweetened cocoa powder, baking powder, baking soda, and salt.
Step 5: Mix Batter
• Alternate adding the dry ingredients and buttermilk to the wet mixture, starting and ending with the dry ingredients. Mix until just combined, taking care not to overmix.
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