Combine flour, salt, pepper and paprika in a plastic bag. Add chicken, shake to coat in bag. Shake off the loose flour from chicken and arrange chicken in a baking dish. Drizzle with melted butter. Bake for 30 minutes.
Meanwhile make the sauce:.
Cook peppers and onions in hot oil until tender,in a skillet.
Stir in the 2 tablespoons of flour.
Add chicken broth, sugar (or Splenda) and crushed red pepper.
Cook and stir until thickened and bubbly.
Remove from heat and add vinegar. Spoon over chicken and bake another 30 minutes.