Cook pasta according to package directions, omitting salt and fat; drain. Combine pasta and oil in a large bowl, and toss well.

Melt butter in a Dutch oven over medium heat; add asparagus, onion, hot sauce, and red pepper. Cook 5 minutes or until asparagus is crisp-tender, stirring frequently. Stir in pasta, salt, black pepper, chicken, and tomatoes; cook 2 minutes or until thoroughly heated. Stir in cheese; sprinkle with paprika.