Step 1

Preheat oven to 350F.

Step 2

Cook pasta according to package instructions, including 1 teaspoon of salt to the boiling water for flavor.

Step 3

Drain the pasta and return to pot. Add the cubed butter to the pot and stir until almost melted.

Step 4

Add the remaining ingredients, reserving 1/2 cup of mixed cheese for the topping, and stir well.

Step 5

Pour the pot contents into a 9x13 baking dish. Top with remaining cheese.

Step 6

Bake for 30 minutes until edges become golden brown and bubbly.