Preheat the oven to 350.
Cook the pasta according to package instructions, erring on the side of "al dente."
Drain the pasta and return it to the pot, turning off the heat but putting the pot back on the burner.
Add 2 cups of cheese and 1 cup of heavy cream and stir until it's creamy and the cheese has melted.
Pour the mixture into a greased 9x13 pan and top with the remaining 2 cups of cheese.
Bake for about 20 minutes and then turn the broiler on for a few minutes to make the top browner (if so desired).