Polenta Gratin with Mushrooms and Fontina

1 (16-ounce) tube of polenta, cut into 1/4-inch-thick slices
Cooking spray
1 (8-ounce) package presliced mushrooms
1 teaspoon bottled minced garlic
1/4 teaspoon salt
1/3 cup sun-dried tomato Alfredo sauce (such as Classico)
1/4 cup chopped fresh basil
1/4 cup (1 ounce) shredded fontina cheese

Preparation
Preheat oven to 500°.
Arrange polenta slices in an 11 x 7-inch baking dish coated with cooking spray, allowing slices to overlap.
Heat a medium nonstick skillet coated with cooking spray over medium-high heat. Add mushrooms; cook 2 minutes, stirring frequently. Stir in garlic and salt. Cover, reduce heat, and cook 2 minutes. Stir in Alfredo sauce and basil.
Spoon mushroom mixture evenly over polenta. Top with cheese. Bake at 500° for 7 minutes or until thoroughly heated.