Pat the steak dry with paper towels and season thoroughly with cumin, smoked paprika, salt, and black pepper.
Heat 1 tablespoon of olive oil in a cast-iron skillet over medium-high heat until shimmering.
Place the steak in the skillet and sear for 4 to 5 minutes per side until the internal temperature reaches 135°F (57°C) for medium-rare.
Transfer the steak to a cutting board and allow it to rest for 10 minutes to retain juices.
While the steak rests, add the corn kernels to the same skillet and cook undisturbed for 2 minutes to achieve a char, then stir and cook for 2 more minutes.
Slice the rested steak against the grain into thin strips.
Distribute the cooked grains into two serving bowls.
Arrange the sliced steak, charred corn, black beans, and diced red onion over the grain base.
Top each bowl with avocado slices.
Drizzle the assembly with lime juice and the remaining tablespoon of olive oil.
Garnish with chopped cilantro and serve.