Prep Time: 20
Cook Time: 12
Serves: Serves: 4 as a meatless main dish*
Remove stems from mushrooms; coarsely chop and set aside. Remove and discard gills from mushroom caps using a spoon. Brush outsides of caps with 1 tablespoon oil; place oiled sides down on a foil-lined baking sheet. Sprinkle salt and pepper over caps.
Heat remaining 1 tablespoon oil in a large nonstick skillet over medium heat. Add mushroom stems, onion and garlic; cook 5 minutes, stirring occasionally. Add spinach to skillet. Turn with tongs until spinach is wilted. Stir in tomato and breadcrumbs; mix well. Add cheese; mix well. Spoon mixture into mushroom caps.
Bake in a preheated 400°F oven for 12 minutes or until hot and mushrooms are tender.