Cook pasta to package directions. Drain and keep warm.
Cut chicken into 1 inch pieces. In small mixing bowl combine 1 tablespoons flour, salt, and red, white and black pepper. Toss flour mixture with chicken to coat. Set aside.
In large skillet over medium-high heat heat oil (add more oil as necessary during cooking.) Add red bell pepper, onion, jalapeno and garlic; cook and stir until tender. Remove veggies with slotted spoon to seperate bowl; set aside.
Add chicken to skillet. Cook and stir about 5 minutes until chicken is tender and no longer pink. Remove chicken to bowl with veggies.
Stir 2 tablespoons four into drippings in skillet. Add chicken broth, milk and worcestershire. Cook and stir until thickened and bubbly. Add monterey jack, stir until cheese melts. Stir 1 cup of the hot mixture into sour cream; return all of sour cream mixture to skillet. Stir in the chicken and veggies. Cook until heated through being carefully not to boil mixture.
Arrange pasta on individual plates or a large serving platter. Spoon the chicken mixture over pasta.