Philly Cheese Steak Sandwiches
A happy mess! 3 T butter, divided1 sweet onion, halved and sliced very thin1/2 green pepper, sliced into very thin strips1 1/2 lb. beef tenderloin, rib-eye or sirloin steak, sliced wafer thincoarse saltfresh-ground pepper4 cups shredded mozzarella or provolone cheese6…
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