1. Combine all crust ingredients and press into a 9 inch pie pan.
2. Bake at 350° for 15 minutes.
3. Remove from oven; set aside.
4. For the filling, sauté garlic and onion in oil for 5 minutes.
5. Combine the potatoes (reserving enough to make 1/2 cup mashed for the topping) and cheese with garlic and onion, chilies, salt and pepper.
6. Mix well and spread over the beef crust.
7. Combine all the topping ingredients and pour over the filling.
8. Bake at 350° for 25-30 minutes.