In a large skillet over medium-high heat, heat 1 tablespoon oil.

Rub steak with taco seasoning and sear until desired doneness, flipping once.

Transfer to a cutting board and let rest 5, then slice against the grain.

Meanwhile, make dressing: In a small bowl, whisk together remaining oil, lime juice, cumin, and oregano, and season with salt.

In a salad bowl, add romaine, seared steak, corn, black beans, tomatoes, and green onions.

Season with flaky salt, if desired.