Step 1

Whisk milk and flour together and cook in a stovetop pan on med-low heat until thickened, stirring constantly. If small lumps have formed, pour through a mesh strainer into a small(ish) bowl, using a rubber spatula to press the thickened milk through the strainer.

Step 2

Cover the dish and refrigerate until cold. To eliminate condensation forming inside the lid, place a paper towel just under the lid but not touching the milk mixture. To speed up the cooling, place the mixture in the freezer for 1/2-1 hour.

Step 3

MIX THE INGREDIENTS IN THE FOLLOWING ORDER, TAKING CARE TO BEAT WELL:

Step 4

Combine 1/2 cup butter and 1/2 cup shortening. Beat 4 minutes on high speed.

Step 5

Add 1 cup of sugar. Beat 4 minutes on high speed.

Step 6

Add cooled milk, flour mixture, and vanilla extract. Beat 4 minutes on high speed

Step 7

Add 3 tablespoons of powdered sugar. Beat 4 minutes on high speed

Step 8

Icing is ready to use!