In skillet coated with cooking spray, saute corn, SPAM, bell peppers, and onion over medium heat 5 minutes or until tender. Transfer mixture to bowl; keep warm. To same skillet, add cream, chili powder, and pepper. Bring to a boil; boil 5 minutes or until cream has slightly thickened, stirring occasionally. Pour over pasta and toss well. Spoon SPAM mixture over pasta. To serve, sprinkle with chopped tomatoes and cilantro.