Caramelized Onion and Mushroom Grilled Cheese
Caramelized Onion and Mushroom Grilled Cheese! Perfectly caramelized onions finished off with a splash of beef stock, sautéed mushrooms with thyme, and melty Swiss cheese.
Ingredients
- 1 large onion thinly sliced
- 2 tablespoons olive oil
- 4 tablespoons butter
- 1 pinch sugar
- 3 tablespoons beef stock
- 8 mushrooms, button & baby bellos sliced
- ½ teaspoon fresh thyme
- as needed pepper
- ½ teaspoon salt
- 4 slices bread like sourdough
- 4 slices swiss cheese
I always use Kosher salt in my kitchen! If using table salt, start with half the amount and adjust to taste, as it is much "saltier" by volume.
Instructions
- Thinly slice the onions into half-moons. Place a large skillet over medium heat and add in 1 tablespoon of olive oil and 1 tablespoon of butter. Once hot add in the onions and a pinch of sugar.
- Sauté, stirring occasionally to prevent burning until caramelized. This will take 20-30 minutes. When the onions have started to soften add in salt. You will know the onions are done when they have turned a rich browned color and are tender.
- Remove from the pan and add in 1 tablespoon of olive oil. Add in the sliced mushrooms and sauté until browned. Add the onions back to the pan. Season with pepper and fresh thyme. Next add in 3 tablespoons of beef stock. Stir until well combined. Remove from the pan and set aside.
- Spread the remaining butter on one side of each piece of bread. Place cheese on each piece of bread (each sandwich will get 2 slices of cheese) and top with the caramelized onions and mushrooms. Put the sandwiches together and heat up a large cast iron skillet over medium heat.
- Cook each sandwich until golden browned and the cheese is melted. Flipping as needed. Enjoy!
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