To a food processor add the rice, beans, onion, potato, oats, BBQ sauce, garlic powder, chili powder, liquid smoke and salt. Pulse a few times until combined but still chunky.
Add the corn and either pulse a couple of times or mix in with a wooden spoon or spatula.
Spoon the mixture into a bowl, and refrigerate for at least 20 minutes but overnight is fine.
Using your hands, shape the mixture into patties. Really squeeze them together well.
Brush a large frying pan with oil and heat over medium heat. Once hot add the burger patties and cook for about 10 to 15 minutes each side or until well set, and golden.
To oven-bake, place the patties on a well greased or parchment paper lined baking tray and bake at 375°F for 25 minutes, gently turning the patties at half-time.
Serve on buns with plenty of BBQ sauce and toppings of your choice.
NOTES
No food processor?In a large bowl add the beans and mash them with a potato masher until they are partially mashed. Add the other ingredients and using clean hands, mix and squish the mixture together.