Cook your grain base: Rinse and cook brown rice or quinoa according to package directions. Fluff and set aside.
A squeeze of lemon and pinch of salt at the end brightens it up.
Mix the dry rub: In a small bowl, combine smoked paprika, garlic powder, onion powder, chili powder, black pepper, kosher salt, and brown sugar.
Season the chicken: Pat the chicken dry. Rub all sides with a light coat of oil, then sprinkle the dry rub evenly, pressing it in so it sticks.
Prep the veggies: Chop broccoli into bite-size florets. Slice peppers and red onion.
Toss with 1 tablespoon oil, a pinch of salt and pepper.
Roast the veggies: Spread veggies on a sheet pan. Roast at 425°F (220°C) for 15–20 minutes, tossing once, until tender with a bit of char.
Cook the chicken (grill method): Heat grill to medium-high. Oil grates.
Grill chicken 5–7 minutes per side, until the internal temp hits 165°F (74°C). During the last 2 minutes, brush lightly with BBQ sauce and let it glaze.
Cook the chicken (stovetop/oven method): Sear in a hot grill pan or skillet 3–4 minutes per side, then transfer to a 400°F (205°C) oven for 8–10 minutes. Brush with BBQ sauce in the last few minutes.
Rest and slice: Let chicken rest 5 minutes, then slice or cube.
This helps keep it juicy and easier to portion.
Assemble: Divide rice or quinoa into 4–6 containers. Add a generous portion of roasted veggies and top with sliced BBQ chicken. Add an extra 1–2 teaspoons BBQ sauce per container if you like.
Garnish: Finish with chopped parsley or green onion and a lemon wedge for a fresh pop when reheating.