Everyday French Onion Mushrooms
Ingredients
- 4 portabella mushrooms
- 1/2 tablespoon olive oil
- 1/2 tablespoon butter
- 2 cups sliced sweet onion
- 1 teaspoon granulated white sugar optional
- 1 tablespoon fresh thyme*
- 3/4 cup beef broth
- Black pepper
- 4 slices swiss cheese from the deli
Instructions
- Preheat oven to 425°F.
- Remove mushroom stems and a small amount of gills with a spoon to provide more area to hold filling.
- Brush both sides of mushrooms lightly with olive oil.
- Place mushrooms cap side down on a rimmed baking sheet.
- Bake for 8 minutes; flip and bake for an additional 4-6 minutes or until tender.
- Remove from oven, and place caps gill side down on a paper towel-lined plate.
- While mushrooms bake, melt butter in a large frying pan over medium heat.
- Add onions, reduce heat to medium-low, and sauté for 20-25 minutes or until golden brown.
- Preheat broiler.
- Add sugar, thyme, and broth, and increase heat to medium.
- Sauté for another 5 minutes or until all liquid is absorbed.
- Place mushrooms cap side down on a rimmed baking sheet, and divide onion mixture among the mushrooms.
- Top each with a slice of swiss cheese.
- Place baking sheet on the upper rack of the oven, and broil for 30-60 seconds or until cheese melts.
Notes
Can be replaced with 1 teaspoon dried thyme