Preheat oven to 350°F . Prepare cake pans with non-stick spray
In medium sized mixing bowl, sift together flour, cocoa, & salt; set aside.
In large mixing bowl beat butter and sugar; add eggs and vanilla. Beat on high until frothy.
Stir together buttermilk and food coloring
Alternating…add flour mix and buttermilk to butter mixture; set mixer to low.
Stir in baking soda and vinegar.
Mix 30 seconds on medium.
Divide batter among cake pans.
Bake for 30-35 minutes.
Cool completely. Frost with luscious Cream Cheese frosting.