Prepare the pasta according to the package directions and drain.
Microwave the frozen peas and carrots according to package directions.
In a large saucepan, melt 2 tablespoons of butter. Stir in garlic and crushed red pepper and cook for about 1 minutes. Add 2 tablespoons of flour. Stir for a couple of minutes until it makes a paste. Pour in the half and half and stir continuously for about 7 minutes until thickened.
Add in the drained pasta, corn, and drained peas and mushrooms. Stir in the shredded cheese. Add salt and pepper to taste.