Prep the base: Cook rice or quinoa according to package directions. Fluff and set aside.
If using greens, chop and chill.
Mix the spice blend: In a small bowl, combine chili powder, cumin, smoked paprika, garlic powder, onion powder, salt, and pepper.
Season the chicken: Pat chicken dry. Rub with oil and sprinkle on the spice blend, coating both sides evenly.
Sear the chicken: Heat a large skillet over medium-high. Add a little oil, then the chicken.
Cook 4–6 minutes per side, until well browned and cooked through (internal temp 165°F).
Glaze with BBQ sauce: Reduce heat to low. Add 1/2 cup BBQ sauce to the skillet and toss the chicken to coat. Let it bubble 1–2 minutes to thicken slightly.
Rest and slice: Transfer chicken to a cutting board.
Rest 5 minutes, then slice or shred. Spoon any extra sauce from the pan over the chicken.
Warm beans and corn: In the same skillet, add black beans and corn with a splash of water. Warm for 2–3 minutes.
Season with a pinch of salt and a squeeze of lime.
Prep toppings: Halve tomatoes, slice onion, dice avocado, chop cilantro, and crush tortilla chips if using. Stir together lime crema if you like.
Build the bowls: Add a scoop of rice or greens. Top with BBQ chicken, black beans, corn, tomatoes, onion, avocado, and cheese.
Finish with cilantro, a few jalapeños, and tortilla chips for crunch.
Finish with sauce: Drizzle on a little more BBQ sauce and/or lime crema. Add lime wedges on the side for a final squeeze.