Created by Derf on January 8, 2012
Step 1: Heat oven to 350 degrees. Thaw spinach and press out liquid, finely chop. Combine spinach, 1 cup cheese, basil, and pepper in a mixing bowl.
Step 2: Clean mushrooms, remove stems. Place mushroom caps top side down on a lightly greased cookie sheet, brush with butter or margarine. Spoon about 2 tablespoons of spinach mixture into each cap. Sprinkle with diced tomato or place slices add salt; sprinkle remaining half cup of cheese over top.
Step 3: Bake for 12 minutes or till heated through OR place on the unheated rack of a broiler pan. Broil 4 inches from the heat for 3 to 4 minutes. Cut into quarters and serve hot.