3 cups all-purpose flour
1 ½ cups granulated sugar
1 teaspoon baking powder
1 teaspoon baking soda
½ teaspoon salt
1 tablespoon cocoa powder
1 ½ cups buttermilk, room temperature
1 ½ cups vegetable oil
Step 1
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First, turn on the oven to 350°F (175°C) and get three round cake pans ready by greasing them and putting parchment paper at the bottom so the cake doesn't stick.
Step 2
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In a big bowl, mix the flour, sugar, baking powder, baking soda, salt, and cocoa powder with a whisk until everything is well-mixed.
Step 3
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In another bowl, mix the buttermilk, vegetable oil, eggs, vanilla, vinegar, and purple food coloring until the mixture is a smooth, even purple color.