In a large skillet over the stove top on medium-high heat, saute bell pepper and onion slices in olive oil for 2-3 minutes. Add chicken chunks. Stir and cook until chicken chunks are cooked through and bell peppers and onions are tender. Add chicken broth, instant rice, salt, garlic powder, chili powder, cumin, paprika, onion powder, sugar, and oregano. Stir and allow it to come to a boil. Cover, reduce heat, and allow it to simmer on medium/low for about 10 minutes, or just until rice has absorbed most of the liquid and is tender. Stir and enjoy immediately with sour cream, shredded cheddar cheese and tortillas, if desired.