Hamburger Biscuit Casserole

2 pounds ground beef
1 small onion, chopped
1 package frozen peas
1 can of refrigerated biscuits
2 small cans tomato sauce
2 Tablespoons flour

Brown ground beef and onion together, add small package of frozen peas. Mix 2 Tablespoons flour into the tomato sauce. Simmer until frozen peas are done. Put these ingredients into a 9x13 inch casserole dish and place refrigerated biscuits on top of meat mixture. Bake casserole at 350 degrees until biscuits are almost done. Place 1/2 slice of cheese on top of each biscuit, continue to bake until cheese is melted.