This pasta bake is forgiving—substitute cheeses as needed (provolone or Asiago work well for Fontina). Add rotisserie chicken or sausage for protein, or toss in sautéed spinach, mushrooms, or roasted peppers for extra veggies. It keeps well in the fridge for 4 days or can be assembled unbaked and frozen for up to 3 months. To freeze: wrap tightly, thaw overnight, and bake as directed.