Heat oven to 325. Lightly spray a 9" pie pan w/ cooking spray. Place 1 pie crust in pan. In lg bowl, beat ricotta cheese and eggs untill combined.
Stir in ham, mozzarella cheese, garlic powder and pepper. Mix well. Pour into pie crust in pan. Sprinkle mix w/ parmesan cheese.
Place remaining crust over mix and fold edges together to seal. Make slits in top crust to vent. Place thin strips of foil over edges to prevent burning. Bake 1 hour. 10 mins before it's done, take foil off.