1. If needed, cook the rice according to package directions.
2. Season the chicken with salt and pepper. Spray a nonstick pan with cooking spray, heat, then add 1 tsp olive oil. Cook the chicken until no longer pink, 4-5 minutes.
3. Cut the chicken into pieces, then place into a food processor. Add the sweet potato puree, cheddar cheese, buttermilk, and blend until smooth.
4. Transfer the mixture to a bowl, then add the rice. Roll into 1 inche balls and place them on a tray lined with waxed paper or aluminum foil.
5. Combine the egg with vegetable puree in a shallow bowl. Then put the breadcrumbs into a second bowl.
6. Roll the rice balls into the egg mixture, then the breadcrumbs.
7. Use the remaining 2 tsp of oil in the non stick pan. Cook the rice balls over medium heat until crispy. 5-7 minutes total. Serve warm.