1 lb. powdered sugar....4 cups...I usually use a little more than this
1 stick real butter at room temperature
1/2 cup crisco shortening
1 tsp. vanilla
2-3 tbsp. milk
Blend butter and shortening....then add powdered sugar and vanilla. Add the milk to the consistency that you want. I continue adding milk and powdered sugar until it tastes how I want it. Note: I always heat my milk when I do this, but you can do whatever.
Also...I add 1 capful of almond flavoring to frosting to add more flavor.