PREP: 30 minutes GRILL: 20 minutes MAKES 6 servings 3 medium red, yellow and/or green sweet peppers, sliced 1 large onion, sliced 2 tablespoons olive oil 2 teaspoons fajita seasoning 3 cloves garlic, minced 1 8-ounce package fresh button mushrooms, halved 1 medium...

























