STEP-1
STEP-2
Meanwhile, in a large saucepan, melt butter over medium heat. Add garlic and cook, stirring, for 1 minute.
STEP-3
Add flour and cook, stirring constantly, for 1 minute more.
STEP-4
Add milk and broth and cook, stirring constantly, until the sauce boils and thickens about 5 minutes.
STEP-5
Add Parmesan, parsley, garlic salt, and pepper. Continue stirring until the cheese has melted.
STEP-6
Add pasta to the sauce and stir to combine. Add mozzarella and stir until melted. Serve warm.