Add the olive oil, lime juice, 1/2 cup cilantro, lime juice, minced garlic, salt, and pepper to a large zip up bag. Add the steak to the bag and seal it closed. Refrigerate the steak for 30 minutes to 2 hours. (Make sure the steak is at room temperature before cooking it. )
To make the dressing, add the Greek yogurt, cilantro, lime juice, ranch seasoning, and water to a food processor. Press "grind" until the dressing is liquified.
Cook the steak over medium heat (on a grill or pan) 4-6 minutes on each side.
Assemble the bowls: Add 1/2 cup each of rice, grape tomatoes, corn, and black beans to each bowl. Top each bowl with the cooked steak, then add half of the dressing to each bowl.