Chipotle Copycat Chicken Burrito Bowl

Name: Chipotle Copycat Chicken Burrito Bowl
Ingredients: 2 cups white rice; 2 tbsp butter; 4 cups water; 1/2 cup chopped cilantro; juice from 1 lime; 2 boneless skinless chicken breasts, pounded out to even thickness (about 1 - 1.5 pounds); 1 tsp chili powder; 1 tsp cumin; 1/2 tsp garlic powder; 1/2 tsp onion powder; 1/2 tsp salt; 16 ounces frozen corn; 1 jalapeno (stem and seeds removed and diced); 1/4 cup chopped cilantro; 1/4 tsp cumin; 1/4 tsp salt; 15 ounce can black or pinto beans (drained and rinsed); Sour cream (for topping); sliced avocado or guacamole (for topping)