Cook, drain, and cool the pasta.
While the pasta is cooking make the dressing.
In approximately a 4-cup bowl mix together the mayonnaise, mustard, vinegar, sugar and onion flakes. Set aside.
Cube the cheese and the ham into ¼ to ½ inch cubes. Set aside.
Drain the pineapple tidbits very well. Set aside.
Once the pasta is cooled add the cheese, ham, pineapple, and the dressing. Mix well. Very gently mix in the the roasted red peppers.
Chill for about an hour before serving.