Preheat oven to 400'. After cooking pasta, drain all the liquied & put into a bowl to the side...Next melt the 1/2 stick of butter. Once melted add the flour to make a rue & stir until thickened. Remove from heat.
Next add the cup of milk, salt, & garlic powder and stir well. Put back onto the burner & put 1 package plus 1/2 of the other into the milk mixture and whisk until cheese is melted.
Once cheese is melted stir into the bowl of pasta & mix thoroughly. Pour into a sprayed casserole dish & sprinkle the remaining cheese ontop then sprinkle the bread crumbs on to that.
Bake uncovered for 20 ~ 25 minutes or until cheese is melted on top & bubbly......