Take the flank steak out of the fridge 30 minutes before cooking and season it generously with salt and pepper.
Heat a skillet over medium-high heat, add olive oil, then place the steak in the skillet. Sear each side for about 4–5 minutes for medium-rare. Let it rest for about 5 minutes before slicing thinly against the grain.
In the same skillet, add another tablespoon of olive oil. Toss in the corn kernels and sauté them for about 5–7 minutes until they turn golden and slightly charred.
In a mixing bowl, combine sour cream, chopped cilantro, minced garlic, lime juice, salt, and pepper. Mix well until everything is thoroughly combined.
Layer cooked quinoa at the bottom of your bowl. Add sliced steak followed by roasted corn and creamy avocado slices. Drizzle generously with cilantro cream sauce and garnish with extra cilantro.