Created by LindasBusyKitchen on March 3, 2012
Step 1: Remove the stems and scrape the gills from the mushrooms.
Step 2: Blanch the spinach in boiling water for 1 minute, then drain and press dry. Roughly dice the spinach. Set aside.
Step 3: In a large saucepan on low heat, saute the onion and minced garlic for 2 minutes, in 2 tablespoons of olive oil.
Step 4: Add the spinach.
Step 5: Season with the salt and nutmeg.
Step 6: Sprinkle with the balsamic vinegar, and toss well.
Step 7: Remove the saucepan from the heat.
Step 8: Fold in the Mozzarella cheese.
Step 9: Stuff the mushroom caps with this mixture. Place caps on a baking sheet.
Step 10: Sprinkle each cap with the Parmesan cheese.
Step 11: Bake at 400 degrees, for 12-15 minutes.