Mix the sauce: In a bowl, whisk the reduced-sugar BBQ sauce, tomato paste, apple cider vinegar, mustard, smoked paprika, garlic powder, onion powder, chili powder, a pinch of salt, and pepper. Taste and adjust with a teaspoon of honey if you want a touch more sweetness.
Prep the chicken: Pat chicken breasts dry and slice them horizontally if thick to create thinner cutlets.
This helps them cook evenly and stay tender. Season lightly with salt and pepper.
Marinate: Add chicken to a zip-top bag or shallow dish. Pour in about two-thirds of the BBQ sauce and coat well.
Marinate at least 20–30 minutes (or up to overnight in the fridge).
Heat the oven or grill: For the oven, preheat to 425°F (220°C). Line a sheet pan with parchment or foil. For grilling, preheat to medium-high and oil the grates.
Prep the veggies: Toss broccoli, bell pepper, red onion, and zucchini with olive oil spray, salt, and pepper.
Spread on a sheet pan in a single layer.
Cook the veggies: Roast for 18–22 minutes, tossing once, until crisp-tender with a bit of char. If grilling, use a grill basket and cook until tender.
Cook the chicken: Oven method: Arrange marinated chicken on a separate lined pan and bake 16–20 minutes, flipping once, until the internal temp hits 165°F (74°C). Grill method: Grill 4–6 minutes per side, basting once with a little reserved sauce, until cooked through.
Rest and slice: Let the chicken rest 5 minutes.
Slice into thick strips. Toss with a spoonful of the remaining BBQ sauce for gloss and moisture.
Make the side: For cauliflower rice, sauté in a nonstick pan with olive oil spray, salt, and pepper for 5–7 minutes until tender but not mushy. For brown rice, portion 1/2 cup per container if using a lower-calorie plan, or 3/4 cup if you need more fuel.
Assemble: Divide cauliflower rice or brown rice among containers.
Add a handful of roasted veggies to each. Top with sliced BBQ chicken. Drizzle any leftover sauce lightly over the chicken only.
Garnish: Add chopped parsley or green onions, and a quick squeeze of lemon for brightness if you like.
Cool and store: Let containers cool uncovered for 15–20 minutes before sealing.
Then refrigerate.