Place the pie crust pouches to stand at room temperature about 15 to 20 minutes.
Preheat the oven to 375 degrees. Spray 48 miniature muffin cups with non-stick cooking spray.
Open and unfold one pie crust, and press out any fold lines. With a 2 and 1/2 inch floured biscuit cutter, cut 12 rounds. Repeat with remaining pie crusts. In the prepared muffin cups, press 1 round of pie crust into the bottom and up the sides of the cup.
In a 4-cup measuring cup, combine the eggs, milk, and the salt. Whisk well. Set aside.
Place one tablespoon of cheese into each of the muffin cups. Evenly divide the ham, about 1/2 teaspoon, into the muffin cups.
Pour egg mixture into each of the 48 cups, filling to within 1/4 inch of the top. Bake at 375 degrees until golden brown, about 25 to 30 minutes. Cool slightly and serve warm.