4 large portobello (portabella? I have no idea what the correct spelling is, and neither does Firefox) mushrooms
1 clove garlic
2 cups spinach (about half of a 5 oz pack)
1/3 c Panko bread crumbs
2 tbsp balsamic vinegar
1/3 c mozzarella cheese.
salt and black pepper to taste
Scrape the gills off of the mushrooms and cut off the stems, if there are any. Preheat the oven to 375, drizzle the mushrooms with oil, and bake them for 10 minutes while you prep the filling. Finely dice the onions and garlic and saute in a large wok-ish pan oil until translucent and aromatic. Add the spinach and reduce heat to low. Once the spinach wilts, add the bread crumbs, vinegar, salt, and pepper, then turn off the heat. Add the cheese and stir until just combined. Take the mushrooms out of the oven and spoon the mixture into the center of each mushroom. Return to the oven and bake for 15 more minutes.