Wipe mushrooms clean + thinly slice; heat 1 tbsp oil in skillet over high, cook undisturbed 3 min; sauté 3-4 min until browned + tender, season with salt/pep, set aside

Heat 1 tbsp oil in a large skillet over high; add ½ beef in a single layer + sear 1 min, push steak to the side + repeat the process; add 3 slices of cheese + cook 1-2 min more breaking up beef with a spatula; stir in mushrooms

Slice 2 buns in half; toast until warm + golden

Divide filling to sandwiches + enjoy!