Brown hamburger and onion together until hamburger is fully cooked. Drain fat.
Add tomato sauce, green beans, salt and garlic sauce. Stir and let simmer on low while you prepare the pie.
Unroll the crescent roll dough and spread it over the bottoms and sides of a 9" pie pan.
Combine beaten egg and 1 Cup of cheese and spread over the bottom of the crust. Spoon hot ground beef mixture onto the crust. Sprinkle with the remaining cheese.
Bake in preheated oven at 375˚ F for 15 - 20 minutes. Let cool for 5 minutes.