In a 9 x 13 inch pan sprayed with Pam, flatten one can of biscuits. In a separate bowl, mix together 3 eggs and 3/4 cup of milk. Place American cheese slices on top of biscuits; pour egg mixture over cheese. Sprinkle crumbled bacon, chopped onion, sausage, green peppers, or other desired ingredients over the top. Bake for 25 minutes at 375 degrees. For a heartier pizza, try adding a layer of frozen hash brown potatoes between the biscuits and cheese.