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Heat butter in skillet over medium heat.
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Add diced apples and onions to pan. Cook until soft, about 15-20 minutes.
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While apples and onion cook, remove stems from mushrooms. Chop stems and add to skillet with apples and onions.
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Add minced garlic. Continue sautéing for another minute or two.
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Remove apple onion mushroom mixture from heat and place in a medium sized bowl.
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Return skillet to medium heat to brown sausage. Cook sausage, breaking apart into small pieces.
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Once sausage is browned, add to the bowl with the apple and onion mixture.
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Add in 1/2 cup shredded parmesan.
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Add salt and pepper to taste.
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Preheat oven to 350 degrees.
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Stuff mushroom cavities with apple onion sausage mixture and place cavity side up on a greased baking sheet.
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Once all mushrooms are filled, sprinkle with remaining parmesan cheese.
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Bake at 350 degrees for 15-20 minutes, until cheese melts.