Preheat oven to 350° F. Prepare three 7-inch cake pans with nonstick cooking spray and parchment circles.
In a large mixing bowl, whisk together the dry ingredients: all-purpose flour, granulated sugar, baking soda, cocoa powder, and salt.
Add the wet ingredients (vegetable oil, eggs, buttermilk, vanilla extract, white vinegar, and red gel food coloring) to the dry ingredients. Whisk the wet and dry ingredients together until the batter is combined and smooth.
Portion the cake batter evenly between the cake pans. Use a kitchen scale to ensure that the batter is equally divided.
Bake cakes for approximately 30 minutes until the cake layers spring back when gently touched. *Please note that baking times will vary if you use different sizes of cake pans.
Remove cake pans from the oven and allow the cake layers to cool in the pan for about 15-20 minutes. Remove the cake layers and transfer to a wire rack to cool to room temperature.