Combine meat, onion, salt, and pepper; cook over low heat 5 minutes or until meat is browned.
Place 2 biscuits, slightly overlapping, on well floured surface. Roll until biscuits form an oval about 5" long. Fill with about 3 tablespoons of meat mixture on 1 biscuit and top with 2 half slices of cheese.
Moisten edges with water, fold the second biscuit over the filling and seal with fork. Prick top.
Bake at 425 for 8 to 10 minutes or until golden brown.