Preheat the oven: Set to 425°F (220°C).
Line a large sheet pan with parchment for easy cleanup.
Prep the chicken: Pat dry and cut into bite-size chunks. This helps it cook evenly and stay juicy.
Season everything: In a large bowl, combine the chicken, broccoli, peppers, onion, zucchini, and tomatoes. Add 2 tablespoons olive oil, smoked paprika, garlic powder, onion powder, oregano, cumin, red pepper flakes (if using), salt, and black pepper.
Toss until everything is evenly coated. If it looks dry, add the extra tablespoon of oil.
Spread on the pan: Arrange in a single layer. Give the chicken a little breathing room from the veggies so it browns, not steams.
Roast: Bake for 18–22 minutes, stirring halfway, until the chicken is cooked through (165°F/74°C internal temp) and the veggies are tender with caramelized edges.
Add the “loaded” toppings: Sprinkle shredded cheese over the pan.
Return to the oven for 2–3 minutes, just until melted.
Finish: Scatter crumbled bacon and green onions over the top. Dollop with sour cream or Greek yogurt. Add herbs if you like.
Serve: Squeeze lemon over the pan for brightness.
Enjoy as is, or serve over rice, cauliflower rice, or quinoa.