Preheat the oven to 350°F / 175°C. Line and grease 3, 6-inch pans. Set aside.
In a large bowl, whisk together 1 cup vegetable oil, 1 cup buttermilk, 2 large eggs, 2 tsp vanilla extract, 1 tsp white vinegar, and 1 tsp red gel food coloring. Mix until combined and the batter is evenly colored.
Add 2 cups of granulated sugar and whisk for 30 seconds to help dissolve the sugar.
Then mix in 2 1/2 cups flour, 2 tsp cocoa powder, 1 tsp salt, 1 tsp baking soda, and 1/2 tsp baking powder. Whisk until combined. The batter should be smooth,
Divide the batter evenly between the prepared pans and bake for 27-30 minutes. Remove pans from the oven and let them cool in the pans for 15 minutes. Carefully flip the layers out of the pans and place them on a wire rack to finish cooling.
Level the cake tops with a serrated knife once they're fully cooled. Use a fork to crumble the cake tops, and cover and set aside. If you're making these in advance, wrap and freeze them at this point.