In a small bowl, mix the chili powder, cumin, garlic powder, onion powder, salt, and pepper. Rub this mixture over the flank steak and let it marinate for at least 30 minutes (or up to overnight in the fridge).
Preheat the oven to 425°F (220°C). Cut the russet potatoes into fries and soak them in cold water for 30 minutes to remove excess starch. Drain and dry the potatoes with a towel.
Toss the potato fries in olive oil, ensuring they are well-coated. Spread the fries in a single layer on a baking sheet lined with parchment paper. Bake for 30-35 minutes, flipping halfway through, until they’re golden and crispy.
While the fries are baking, grill the marinated flank steak over high heat for about 4-5 minutes per side for medium-rare, or until it reaches your desired doneness. Remove from heat and let it rest for 5 minutes before slicing thinly against the grain.
Once the fries are done, remove them from the oven and top hot fries with sliced carne asada. Sprinkle shredded cheddar cheese generously over the top.
Return the loaded fries to the oven for an additional 5 minutes or until the cheese is fully melted.
Remove from the oven and drizzle sour cream and guacamole over the cheese. Add a generous scoop of pico de gallo, and garnish with fresh cilantro and sliced jalapeños if desired.
Notes
For extra flavor, let the steak marinate overnight.