INGREDIENTS
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8 oz to 12oz flank steak (you can also sub a different cut of steak)
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2 large green bell peppers (blanch ahead of time if you would like a softer pepper)
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1 medium onion
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6 ounces baby bella mushrooms
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2 tablespoons butter
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2 tablespoons olive oil
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Pinch of fresh thyme (can substitute dried too)
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Salt and pepper to taste
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8 slices provolone cheese