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| russet potatoes: 8 whole potatoes |
| sharp cheddar cheese (shredded): 1 cup (grated) |
| grated parmesan cheese: 1/2 cup |
| mozzarella cheese, whole milk (shredded): 1/2 cup |
| whole milk: 1 1/2 cups |
| eggs: 1 |
| garlic salt: 1/2 tsp |
| black pepper: 1/2 tsp |
| cayenne pepper: 1/2 tsp |
| onion salt: 1/2 tsp |
Credit: Food.com