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Preheat your oven to 400 degrees.
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Clean your mushrooms by scraping the gills off the underside.
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Rub oil on the tops and bottoms of the mushrooms and then place on a cookie sheet.
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Bake for 10 minutes and then cool.
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In the meantime brown your thinly sliced steak in a frying pan that has been sprayed with cooking oil. It just needs to be browned and can be rare inside.
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In another sauté pan, add your oil, onions and green peppers and sauté for about 15 minutes until both the are well cooked and brown.
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Add your steak to your onions and peppers.
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Stuff two mushrooms with 6 small meatballs each. Top those with pasta sauce and half of the shredded cheese.
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Stuff the other two mushrooms with the slices of steak, then the pepper and onion mixture and lastly the shredded cheese.
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Set all mushrooms on a cookie sheet and broil for 5-10 minutes until cheese is melted and browned.
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Watch so they do burn.
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Enjoy!