Ingredients
Serves: 6
Prep Time: 20 mins
Total Time: 55 mins
6 slices sandwich bread
6 slices swiss cheese, cut in half diagonally
6 slices provolone cheese, cut in half
1/2 stick unsalted butter, divided
1 teaspoon olive oil
2 large onions, sliced
1 can beef broth
2 tablespoons white wine (optional)
¼ teaspoon dried thyme
salt and pepper, to taste
Preparation
