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Heat a large skillet heat oil. Add the onion and garlic.
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Stir onions and garlic so the garlic does not burn. When the onions are translucent add mushrooms.
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Cook mushrooms for 1-2 minutes.
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Add stock, salt and pepper and cook until mushrooms are golden brown. Mix in butter. When butter is melted remove from heat and mix in apple cider vinegar.
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Quickly toss Mushrooms kale so that the kale is coated with the cooking liquid. Place salad green in bowl, top with mushroom kale mixture then top with Swiss cheese.