Mix cake mix an cocoa together in a large mixing bowl until there are no lumps.
Add eggs, buttermilk* and food coloring.
Beat well.
Mix the baking soda and vinegar together in a small bowl.
Fold baking soda and vinegar mixture into cake mixture.
Pour into a greased 9x13 or 9 inch round baking pan**
Bake at 350 degrees for 25-35 minutes.
Icing Directions
In a mixer beat butter until soft and creamy.
Add shortening and beat again. The longer you beat the shortening the lighter it will make the frosting. I beat mine for about 3 minutes.
Add vanilla and mix well.
Add powder sugar 1 cup at a time. I place a towel over the bowl to prevent a huge mess from the sugar flying every. You still might have a small mess but nothing like what you would have if you don't cover it at all.
Add milk one tablespoon at a time. If you don't like the consistency you can add more buttermilk one tablespoon at a time until you get the consistency you are looking for.
Notes
*Pour 1 Tablespoon and 1 teaspoon of white vinegar in a two cup measuring cup. Fill until it reaches 1⅓ cup with almond milk or any milk.
**Using the cake mix will make a thin cake if using two 9 inch cake pans. If you want a layered cake with thicker layers you will need to double the recipe.
Recipe by Let's Be Yummy at http://letsbeyummy.com/2014/11/30/red-velvet-cake-gluten-free-recipe/