Preheat the oven to 400 degrees Fahrenheit. Prepare the pasta according to the directions on the package. Strain and set aside. In a medium sized saucepan, melt the butter over low heat. Add the milk, nutmeg and ricotta cheese and continue to heat for 5-10 minutes or until the mixture is hot but not boiling. Remove the pan from heat and stir in the sour cream, gruyere, cheddar, emmentaler, 1 cup of the smoked gouda and the bacon squares. Set aside.