1 Tbsp. olive oil
1 medium onion, diced
3 cloves garlic, minced
2 Tbsp. balsamic vinegar
1 (15 oz.) can tomato sauce
1 (15 oz.) can diced tomatoes
1/4 tsp. red pepper flakes
basil and oregano, to taste
1 cup quinoa
2 cups water or broth
1 lb. boneless, skinless chicken, cooked*
2/3 cup shredded part-skim mozzarella cheese, divided
2 Tbsp. grated Parmesan or Romano cheese
2 Tbsp. breadcrumbs (optional)
2 Tbsp. chopped fresh parsley (optional)