Preheat oven to 350F.
Cream together butter and sugar until fluffy. (It took me 5 minutes on medium speed with my hand mixer)
Mix in eggs, one at a time.
Add remaining wet ingredients (sour cream, milk, vanilla and food coloring) and mix just until combined.
In a separate bowl mix together dry ingredients (flour, cocoa, baking soda and salt).
Slowly add dry ingredients to wet and mix until combined. Don't over mix.
Fill cupcake liners 2/3 full and bake for 20-25 minutes or until a toothpick comes out clean.
Let cool in tin for 5 minutes and then move to cooling rack and let completely cool.