Wash hands with warm, soapy water for 20 seconds.
Cook pasta according to package directions. Drain.
While pasta is cooking, wash and cut vegetables into bite-sized pieces.
Steam vegetables until crisp tender, about 5 minutes.
In a saucepan or electric skillet, heat butter, margarine, or oil. Once butter or margarine is melted, add flour and cook until a paste forms and it browns slightly.
Add milk in a little at a time and whisk constantly until thick. If clumps form, use a spoon to break them up.
Add garlic powder or seasonings and pepper to the sauce.
Remove from heat and stir in cheese. Pour over pasta.
Add vegetables and stir.