Heat 2 tablespoons olive oil in a large skillet over medium-high heat.
Season the 1 lb chicken pieces with 1/2 tsp salt, 1/4 tsp pepper, 1 tsp chili powder, 1 tsp cumin, 1 tsp smoked paprika and 1 tsp dried oregano.
Add the seasoned chicken to the hot skillet and cook, stirring occasionally, until cooked through, about 2–3 minutes.
Add the chopped onion, minced garlic and chopped red bell pepper to the skillet; cook until the onion is translucent, about 3–4 minutes.
Stir in 1½ cups refried beans and 1/4 cup water; cook and stir for about 2 minutes until the mixture thickens and is no longer watery.
Warm the tortillas in the microwave for about 30 seconds to make them pliable, or warm them by another preferred method.
Assemble each tortilla with about 1/8 of the rice, a portion of the chicken and bean mixture, some corn, and shredded cheddar; then fold into burritos.
To finish, either wrap burritos in foil and bake at 350°F (175°C) for 10 minutes, or pan-fry in a skillet over medium-high heat 2–3 minutes per side until golden and the cheese melts.
Serve warm with salsa, sour cream and optional nacho cheese sauce.