Hearty Hamburger Pie

Ingredients

• 9-inch pie crust
• 1 lb. lean ground beef
• 1 egg
• 1/2 tsp. salt
• 1/4 c. dry bread crumbs
• 1/4 tsp. ground cumin seed
• 1/8 tsp. garlic powder
• 1 tsp. dry mustard
• 1 tsp. Italian dried herbs
• 1 medium onion, sliced and separated
• 1 1/4 c. mushrooms, sliced (fresh)
• 1 1/2 c. potatoes, sliced and peeled
• 1/2 c. shredded Swiss cheese
• 1 c. shredded Cheddar cheese
• 2 Tbsp. dried parsley flakes