- Preheat oven to 350 degrees F (175 degrees C). Grease one 8×8 inch casserole dish and set aside.
- Beat together the eggs and milk. Add seasoning salt, ham, Cheddar cheese, Mozzarella cheese and minced onion. Pour into prepared casserole dish.
- Bake uncovered at 350 degrees F (175 degrees C) for 40 to 45 minutes.