Season both sides of the steak with sea salt, freshly cracked pepper, and garlic powder, to taste.
Heat a large grill pan that has been coated with cooking spray over medium-high heat. Cook the steaks for 3 minutes on the first side, then flip and continue to cook for a couple of minutes, or until the steak has reached the desired degree of doneness. Side Note: My steaks were thin but if yours are thicker you will need to cook them longer. Place the steaks onto a cutting board to rest for 5 minutes before slicing them into bite-sized chunks.
Heat the refried beans in a small saucepan over medium heat, stirring often, until hot.
Wrap the flour tortillas in a paper towel and cook in the microwave for 20-30 seconds or until warm and pliable.
Spread the hot refried beans down the center of the warm tortillas then top with steak pieces followed by lettuce, avocado, cheddar cheese, tomato, and green onions. Serve with salsa and sour cream if desired. Enjoy.