Spicy Steak Fajitas

Seal bag, shake to coat steak pieces
Add the peppers and onions to the bag and close the bag
Shake the bag again to coat the vegetables
Add 1 tablespoon of olive oil to a skillet and add the ingredients from the bag to the heated skillet.
Cook until the vegetables are just tender and the steak is done.
Serve with warm tortillas, sprinkle with grated cheese and your choice of optional toppings