Preheat the oven to 350 degrees F.
Spray a large saucepan with cooking spray and place pan over medium-low heat. Add onions and bell peppers and cook, stirring for 5 minutes.
Add garlic, basil and oregano and cook, stirring, for 15 seconds. Stir in tomatoes and tomato paste. Partially cover and simmer for 10 minutes.
While the sauce is simmering, brown the chicken.
Dredge the chicken pieces in the seasoned flour and brown skinned-side down until golden, about 3 minutes. As the pieces brown, transfer to a baking dish.
Pour the sauce over the chicken. Cover the baking dish with parchment paper or aluminum foil. Bake for 30 minutes.