Preheat and prep: Heat the oven to 425°F (220°C). Line a large sheet pan with parchment for easy cleanup.
Pat the chicken dry with paper towels.
Mix the sauce: In a bowl, combine BBQ sauce, ranch seasoning, olive oil, garlic, smoked paprika, and a pinch of pepper. Taste and adjust salt based on your BBQ sauce (some are quite salty).
Coat the chicken: Add the chicken to the bowl and toss until fully coated. Let it sit while you prep the vegetables, about 5–10 minutes.
Season the veggies: On the sheet pan, toss broccoli, peppers, and red onion with a drizzle of olive oil, a light sprinkle of ranch seasoning (if you have extra), salt, and pepper.
Spread into an even layer, leaving room for the chicken.
Arrange and roast: Place the coated chicken on the sheet pan. Roast for 18–22 minutes, flipping the chicken once halfway. Veggies should be tender with a bit of char; chicken should reach an internal temp of 165°F (74°C).
Cook your base: While everything roasts, cook rice or quinoa according to package directions.
If roasting potatoes, start them before the chicken (they’ll need 30–40 minutes).
Rest and slice: Let the chicken rest for 5 minutes, then slice or chop into bite-sized pieces. Toss with any pan juices for extra flavor.
Assemble: Divide the base among 4–5 meal prep containers. Add a generous portion of veggies and top with the chicken.
Drizzle with a spoonful of BBQ sauce or a light swirl of Greek yogurt mixed with a pinch of ranch seasoning. Finish with cilantro, green onions, or a squeeze of lemon or lime.
Cool and store: Let containers cool, lids off, for about 15–20 minutes before sealing and refrigerating.