Step 1

In a large skillet over medium high heat, add 2 tbsp olive oil. When hot, add mushrooms and onions and saute for 3-4 minutes until soft.

Step 2

Turn heat up to high and add sliced steak and sprinkle with seasoning salt. Fry for 2-3 minutes. You want it to sear and it will cook very quickly.

Step 3

On a rimmed baking sheet, open sub roll and pile on the steak mixture.

Step 4

Top with thick slice of provolone and heat under broiler or toaster oven for 2-3 minutes until cheese is melted and bubbly.

Step 5

Remove from oven and top with mayo