Slice large onion and cook in skillet in 2 T butter till onion is soft and golden brown. Stir occasionally.
Stir in 1 cup sliced mushrooms, cook and stir for 2 minutes. Remove from heat, sprinkle with sea salt and 1 tsp berry-balsamic vinegar.
Place slices of desired cheese on 4 slices of sourdough bread.
Top with onion mixture and another slice of bread.
Butter bread and cook on griddle over medium heat till cheese is melted.
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