St. Patrick's Day: Shamrock Shakes

2 cups mint ice cream
1/3 - 1/2 cup milk, half and half, or heavy cream
2 Tbsp Creme de Menthe liqueur
a few drops of Green food coloring
Chocolate mint cookies

1. In a blender blend all ingredients until smooth.
2. Add more milk to reach desired thickness.
3. Serve with crumbled chocolate mint cookies.
4. This amount yield 2 small shakes