Season the flatiron steak on all sides with our Salt Pepper + Chocolate Chile seasoning from Spiceology. Let set at room temperature for about an hour.
Heat a grill for high direct cooking. Add the flatiron steak and cook, hot and fast, for about 4 minutes per side. Set aside, loosely covered with foil.
Heat a large skillet or flattop on the grill. Spread about a tablespoon of refried beans on one tortilla and then top with another. Sprinkle some cheese directly on the flattop (or in the pan) and top with a tortilla. Cook until the cheese is crispy.
Thinly slice the steak across the gain for serving.
Build the tacos with the cheese on the outside, thinly sliced steak inside and toppings of your choice.