Heat a large skillet over medium-high heat. Add the chicken breasts and season with garlic powder, chili powder, cumin, salt and pepper. Cook for 8 minutes per side or until cooked through.
Remove the chicken from the skillet and set aside to cool. Once cooled, shred the chicken.
Add the olive oil to the skillet. Add in the onion, garlic and bell pepper. Cook for 5 minutes or until vegetables are softened.
Add in the shredded chicken, cooked rice and black beans. Stir to combine.
Stir in 1 cup of cheese until melted.
Divide the burrito filling among 8 tortillas. Sprinkle each burrito with remaining cheese.
Roll up each burrito tightly and place on a baking sheet lined with parchment paper.
Bake for 10-15 minutes or until cheese is melted and bubbly.