Slice the steak into thin strips and discard excess fat. Sprinkle the sliced meat with salt and pepper.
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1
Heat the olive oil in a large skillet over HIGH heat and add the sliced steak. Brown the meat for 1 minute then remove.
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Reduce the heat to MED-HIGH and melt the butter. Add the onions and cook for 1 minute, then add the mushrooms.
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Cook mushrooms until golden brown, then add the flour and cook for 1 minute, while stirring.
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