I saw this on my MoMs board (a lot of them talk about this damn shamrock shake too) and thought you might be interested:
Copycat McDonald's Shamrock Shake
2 cups vanilla ice cream
1 cup milk
8 drops green food coloring
2 tablespoons crack additive
1/8 teaspoon mint extract ( or amount for desired flavor)
Blend well and enjoy!
Re: MrsRosie