In a large nonstick saucepan, heat chicken broth to a boil; slowly stir in cornmeal. Reduce heat to low; cook, stirring frequently, 15 to 20 minutes or until mixture is very thick and pulls away from side of pan. (Mixture may be lumpy.) Pour polenta into greased 9x5-inch loaf pan. Cool; refrigerate 2 to 3 hours or until firm.
Heat oven to 350 degrees F. Combine garlic powder, Italian seasoning, salt and pepper in small bowl; rub on all surfaces of chicken. Arrange chicken, breast side up, in single layer in 13x9-inch baking pan. Bake, uncovered, about 45 minutes or until chicken is no longer pink in center and juices run clear.
Remove polenta from pan; transfer to cutting board. Cut polenta crosswise into 16 slices. Cut slices into triangles, if desired. Spray large nonstick skillet with cooking spray; heat over medium heat until hot. Cook polenta about 4 minutes per side or until lightly browned.
Place spinach leaves, if desired, on serving plates. Arrange polenta slices and chicken over spinach; top with Tuscan Tomato Sauce.
TUSCAN TOMATO SAUCE
Makes: About 3 cups
Nonstick cooking spray
1/2 cup chopped onion
2 cloves garlic, minced
8 plum tomatoes, coarsely chopped
1 can (8 ounces) tomato sauce
2 teaspoons dried basil leaves
2 teaspoons dried oregano leaves
2 teaspoons dried rosemary
1/2 teaspoon pepper
Spray medium nonstick saucepan with cooking spray; heat over medium heat until hot. Add onion and garlic; cook and stir about 5 minutes or until tender.
Stir in tomatoes, tomato sauce, basil, oregano, rosemary and pepper; heat to a boil. Reduce heat to low and simmer, uncovered, about 6 minutes or until desired consistency, stirring occasionally.