Cook the pasta according to package directions; drain well. Mix the seasonings in a shallow dish. Reserve 2 tsp. Stir 2 Tbsp. flour into remaining seasoning mixture in dish. Coat the chicken in seasoned flour; discard any remaining seasoned flour.
In a large skillet, heat oil on medium heat and add the chicken in batches. Cook for 5 minutes on each side or until golden brown and cooked through. Add additional 1 Tbsp. oil as needed. Remove chicken from skillet and keep warm.
Heat the remaining 1 Tbsp. oil in skillet. Add onion; cook and stir for 3 minutes or until softened. Stir in 1 Tbsp. flour. Add tomatoes, stock and reserved seasoning mixture. Bring to a boil, stirring occasionally, then reduce heat to low and simmer for 5 minutes. Stir in the half-and-half. Return chicken to skillet. Cook until heated through. Serve over pasta.