Preheat oven to 375 degrees.
Place rice, corn, chicken stock, diced tomatoes and cilantro in medium rectangular baker. Stir to combine.
Mix paprika, garlic powder, black pepper and cayenne pepper in small bowl. Rub spice mixture on chicken breast and place on top of the rice. Cover with shredded cheese.
Bake uncovered for 35-40 minutes. Depending on the thickness of your chicken breast, it may take a little longer or less to cook. Internal temperature should be 165 degrees in the thickest part of the breast and juices run clear.
Remove from oven and garnish with additional chopped cilantro, sour cream and shredded cheese if desired!