Easy Red Velvet Cake
["1 box fudge marble cake mix", "1 tsp. baking soda", "2 eggs", "1 1/2 c. buttermilk", "1 (1 oz.) bottle red food coloring", "1 tsp. vanilla"]
["Combine cake mix and baking soda. Add eggs, buttermilk, food coloring and vanilla. Blend on low until moistened. Beat on high for 2 minutes. Pour into greased pan and bake at 350\u00b0 for 30 minutes or until toothpick comes out clean. Cool before icing."]
["cake mix", "baking soda", "eggs", "buttermilk", "coloring", "vanilla"]