1. Heat a skillet over medium-high heat.
2. Once hot, add walnuts to the skillet and toast them for 5 to 7 minutes, until they are golden brown.
3. Once toasted, remove the walnuts from heat and let them cool.
4. In the meantime, reheat the skillet to medium-high heat.
5. Once hot, add oil and onions, sautéing for 3 to 5 minutes, until tender.
6. Once cooked, remove the onions from heat and let them cool.
7. In a large bowl, lightly mash together cooked black beans.
8. Once the walnuts are cooled, blend them with the chili, cumin, paprika, salt, and pepper in a food processor or blender until it's a powder.
9. In another large bowl, mix together the cooked rice, walnut powder, sautéed onions, bread crumbs, and BBQ sauce, until a dough-like consistency forms.
10. Divide dough into 5 sections, and then form them into patties.
11. Once patties are formed, heat the grill to medium-high heat.
12. Once hot, grease the grates with avocado oil and add the patties, grilling for 3 to 5 minutes per side.
13. Once cooked, remove patties from the grill, compile burgers, and serve!
