1. Prepare Cheese Tortellini as directed on package. Drain, return to saucepan and set aside.
2. In a small saucepan, melt margarine over medium heat. Stir in flour; cook 1 minute. Add salt, pepper and milk, stirring until thick and bubbly.
3. Add American Processed Cheese Slices to milk mixture and stir until cheese slices have melted. Pour cheese mixture over Cheese Tortellini and gently stir. Makes 4 cups.