Preheat and prep: Heat oven to 425°F (220°C). Line two sheet pans with parchment.
Pat chicken breasts dry with paper towels.
Season the chicken: In a small bowl, mix smoked paprika, garlic powder, onion powder, chili powder, pepper, and salt. Rub with 1 tablespoon olive oil, then coat both sides of the chicken with the spice mix.
Make the BBQ glaze: In another bowl, stir BBQ sauce with apple cider vinegar and honey if using. This adds tang and helps with caramelization.
Roast the veggies: Toss broccoli, bell pepper, and red onion with 1 tablespoon olive oil, plus salt and pepper.
Spread on one sheet pan. Roast for 18–22 minutes, stirring once, until tender with browned edges.
Bake the chicken: Place chicken on the second sheet pan. Bake for 10 minutes, brush tops with half the BBQ sauce, then bake 8–10 minutes more, until internal temp reaches 165°F (74°C).
Rest and slice: Let chicken rest 5–10 minutes.
Slice or dice. Toss with the remaining BBQ sauce so every bite is coated.
Cook the grains: While chicken bakes, cook brown rice or quinoa according to package directions. Fluff with a fork and season lightly with salt.
Assemble: Divide rice, roasted veggies, and chicken into 4–5 meal prep containers.
Garnish with parsley or green onions if you like.
Cool and store: Let containers cool uncovered for about 15–20 minutes before sealing. Label with date.