Instructions

  1. Preheat the oven to 400*F.
  2. Coat a baking sheet with cooking spray.
  3. Place the mushrooms upside down on the sheet, bake for 5 minutes, then set aside.
  4. Combine the tomato paste, tomatoes, anchovy paste, if using, and garlic in a small bowl.
  5. Mix well.
  6. Spoon 1/4 cup of the sauce mix into the center of each mushroom.
  7. You'll have some leftover for a later batch.
  8. Layer the onion on top of the mushrooms, then sprinkle on the cheeses.
  9. Arrange the pepper slices on top.
  10. Add the salt and pepper to taste.
  11. Bake for 10 minutes until the cheese is golden brown and melted.
  12. Enjoy!