Heat olive oil in a large skillet over medium-high heat. Add the steak slices and season with taco seasoning, salt, and pepper. Cook until the steak is browned and cooked through, about 5-7 minutes.
While the steak is cooking, prepare the rice, beans, and corn. If using frozen corn, heat it according to package instructions.
In a large bowl, combine the cooked rice, black beans, corn, diced red bell pepper, and red onion. Mix well.
To assemble the burrito bowls, start with a base of the rice mixture in each bowl. Top with the cooked steak, shredded lettuce, avocado slices, salsa, sour cream, and chopped cilantro.
Serve with lime wedges on the side.