Grilled Cheese with Gouda, Roasted Mushrooms and Onions

Ingredients:

8 slices of sourdough bread
2 cups shredded Gouda cheese
1 cup sliced mushrooms
1 large onion, thinly sliced
4 tablespoons butter, divided
1 tablespoon olive oil
1 teaspoon salt
1/2 teaspoon black pepper
1 teaspoon fresh thyme leaves (optional)
Directions:

Prepare the Roasted Mushrooms and Onions:

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