- Preheat a grill or grill pan over medium-high heat. 
- In a small bowl, combine olive oil, garlic powder, onion powder, smoked paprika, salt, and pepper. Rub the mixture all over the skirt steak. 
- Once the grill is hot, place the skirt steak on it. Cook for about 4-5 minutes on each side for medium-rare, or until desired doneness. Remove from the grill and let it rest for 5 minutes before slicing against the grain. 
- While the steak is resting, prepare the rice bowls. In each bowl, layer the cooked rice, black beans, corn, cherry tomatoes, and sliced avocado. 
- Slice the skirt steak and arrange it on top of the rice bowls. 
- Squeeze fresh lime juice over each bowl and garnish with cilantro.