Creating ranchero steak with potatoes can be simple if you follow these clear steps:

1. Prepare the Marinade: In a bowl, mix the olive oil, lime juice, cumin, chili powder, smoked paprika, salt, and black pepper until well combined.
2. Marinate the Steak: Place the flank steak in a large zip-top bag or shallow dish. Pour the marinade over the steak. Seal the bag or cover the dish, and refrigerate for at least 1 hour or overnight for better flavor absorption.
3. Cook the Potatoes: While the steak is marinating, boil a pot of water. Add the diced potatoes and cook for about 8-10 minutes until slightly tender but still firm. Drain and set aside.
4. Sauté Vegetables: In a large skillet over medium heat, add a splash of oil. Sauté the diced onion, bell pepper, and minced garlic until softened, about 5 minutes.
5. Add Potatoes: Add the boiled potatoes to the skillet, and continue to cook for about 8-10 minutes until they are golden and crispy, stirring occasionally.
6. Cook the Steak: Remove the steak from the marinade. Heat a grill pan over medium-high heat. Cook the steak for about 5-7 minutes on each side for medium-rare, or longer for desired doneness.
7. Rest the Steak: Once cooked, remove the steak from the heat and let it rest for about 5 minutes before slicing.
8. Slice and Serve: Slice the steak against the grain into strips. Serve the steak on a plate alongside the sautéed potatoes and vegetables.
9. Garnish and Enjoy: Sprinkle fresh cilantro on top before serving for an extra burst of flavor.

By following these straightforward steps, you can create a delicious ranchero steak with potatoes that your family will love!