Cheesy Caramelized Onion Mushrooms

1: Bake mushroom caps, gills up at 400° for about 15 minutes.

2: Meanwhile, sauté 1 large red onion in 2 tablespoons olive oil, avocado oil, or coconut oil on low heat for at least 10-15 minutes until wilted.

3: Add 1-2 tablespoons of balsamic vinegar and 1-2 tablespoons of brown or coconut sugar to the onions.

4: Optionally, add a pinch of salt and pepper.

5: Take out the mushroom caps and blot with a towel.

6: Fill the mushroom caps with the caramelized onions.

7: Top with a slice of provolone cheese or cheese of your choice.

8: Broil for 2 minutes or until the cheese is melted.