1
Season the steak slices with salt and pepper, then add them to the skillet. Cook until the steak is just browned, about 3-4 minutes.
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2
Remove the skillet from heat. Spoon the steak, onions, and mushrooms evenly into each bell pepper half.
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3
Return the peppers to the oven and bake for another 10 minutes, or until the cheese is bubbly and golden.
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