1. Preheat oven to 450°. 2. Heat a 12-inch nonstick skillet over medium-high heat. 3. Coat pan with cooking spray. Add mushrooms and shallots to pan; sauté 7 minutes or until mushrooms are tender. 4. Add garlic and thyme; sauté 1 minute. Stir in vinegar; remove from heat. 5. Place crust on the bottom rack of oven. Bake at 450° for 4 minutes. 6. Place the crust on a baking sheet. Spread mushroom mixture evenly over crust; sprinkle evenly with prosciutto and fontina cheese. Bake at 450° for 6 minutes or until cheese melts. ---------------------------------------------------------------------------
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