Spinach Stuffed Mushrooms

1 pkg. Stove Top Stuffing for chicken
1 1/2 cups hot water
40 fresh mushrooms (about 2 lb.)
4 Tblsp. butter
4 cloves garlic, minced
1/2 pkg. (10 oz.) frozen chopped spinach, thawed, well drained
1 cup shredded mozzarella cheese
1 cup grated parmesan cheese

Heat oven to 400 degrees. Mix stuffing mix and water. Remove mushroom stems; chop stems. Melt butter in skillet. Add stems and garlic; cook and stir until tender. Add to stuffing with spinach and cheese; mix well.

Spoon into mushroom caps. Place in shallow baking pan. Bake 20 minutes or until tender.