Preparation Steps

• Preheat oven to 350°F (175°C). Line a muffin tin with cupcake liners.
• In a large bowl, whisk together flour, sugar, baking powder, and salt.
• In a separate bowl, combine oil, milk, eggs, and vanilla extract. Mix well.
• Add wet ingredients to dry ingredients and mix until just combined. Do not overmix.
• Divide the batter in half. In one bowl, stir in cocoa powder.
• Spoon alternating dollops of vanilla and chocolate batter into each cupcake liner.
• Swirl the batters together using a toothpick or skewer to create a marble effect.
• Bake for 20-22 minutes, or until a toothpick inserted into the center comes out clean.
• Let cupcakes cool in the muffin tin for a few minutes before transferring them to a wire rack to cool completely.