Love mint, love shamrock shakes! I could drink one everyday if it wasn't for all of the calories! Then I read a recipe that cut the calories down quite a bit:
2 cups of Frozen Vaniilla Greek Yogurt
1 cup Skim Milk
1/4 teaspoon of mint extract
Green Food Coloring
Change measurements to taste. From what I added up, a 12oz glass is about 165 calories! Not bad!