Spray the crockpot with nonstick spray and place the cubed chicken in the bottom of the crockpot in an even layer.
Sprinkle the taco seasoning evenly over the chicken.
Add the salsa, rinsed black beans, frozen corn, dry rice, and chicken broth to the crockpot; stir gently to combine and distribute ingredients.
Cover and cook on low for 3 to 3½ hours, until the chicken is cooked through and the rice is tender.
Stir in half of the shredded cheese, then cover and cook 10–15 minutes more until the cheese melts.
Stir in the chopped cilantro.
Spoon the filling into the center of each tortilla, top each with about 2 tablespoons of the remaining cheese and 2 tablespoons pico de gallo, then roll to form burritos.
If desired, heat a cast iron skillet over medium heat and grill the burritos seam-side down until tortillas are crispy and golden.
Serve immediately with guacamole, extra salsa, or sour cream as desired.