1. 1. Cook the pasta according to package instructions in boiling water.

2. 2. In a separate pan, cook the beef strips until browned and set aside.

3. 3. In the same pan, melt butter and stir in all-purpose flour to make a roux.

4. 4. Slowly add boiling water while stirring to create a smooth sauce.

5. 5. Add American cheese and stir until melted and creamy.

6. 6. Mix in the cooked beef strips and apples, stirring until heated through.

7. 7. Serve the creamy beef alfredo sauce over the cooked pasta.

8. 8. Garnish with crushed cereal for added texture and flavor.