2 tsp olive oil 1 medium onion, diced 1 lb. boneless skinless chicken thighs, cut into bite-size pieces 3 cloves garlic, minced ½ tsp fennel seeds, crushed pinch red pepper flakes 6 cups chicken broth 1 28oz. can diced tomatoes 1 cup tomato sauce 2 tbsp tomato paste 1 tsp Italian Seasoning 2 cups penne…