Step 1

To make the meatballs, preheat oven to 425°F. Line a large baking pan with parchment paper. Set aside.

Step 2

In a large bowl, combine beef, breadcrumbs, cheese, parsley, milk, eggs, garlic, salt, and pepper. Shape mixture into 12 (1½-inch) balls and place onto prepared pan.

Step 3

Bake until cooked through, about 15 minutes. Set aside.

Step 4

Preheat (or lower) oven temperature to 375°F.

Step 5

In a 12-inch cast iron skillet, melt butter over medium heat. Add flour and cook for one minute, whisking constantly.

Step 6

Whisk in milk, garlic, salt, oregano, red pepper, and nutmeg. Cook, whisking constantly, until mixture is thickened, about 5 minutes. Stir in 1 cup Parmesan and 1 cup fontina until melted. Remove from heat.

Step 7

Stir in cooked pasta until combined. Top with meatballs, pasta sauce, and remaining ½ cup of Parmesan and fontina cheeses.

Step 8

Bake until bubbly and cheese is melted, about 20 minutes. Serve immediately.