1. 1. Preheat Your Oven and Prepare Your Pan: Start by preheating your oven to 400 F (200 C). Line a large baking sheet with parchment paper for easy cleanup. This step is crucial for preventing sticking and making post-dinner tidying a breeze.

2. 2. Chop and Combine Vegetables: In a large mixing bowl, combine the red onion wedges, bell pepper pieces, quartered potatoes, and broccoli florets. Drizzle with 1 tablespoon of olive oil, then sprinkle with garlic powder, onion powder, smoked paprika, salt, and black pepper. Toss everything together until the vegetables are evenly coated with the seasonings.

3. 3. Prepare the Chicken: Add the cut chicken pieces to the same bowl with the seasoned vegetables. Drizzle the remaining 1 tablespoon of olive oil over the chicken, then add a generous amount of salt and pepper. Toss again to ensure the chicken is also well-seasoned and lightly coated with oil.

4. 4. Arrange on Baking Sheet: Spread the chicken and vegetables in a single layer on the prepared baking sheet. Make sure not to overcrowd the pan; if necessary, use two baking sheets to ensure everything roasts evenly and gets nicely browned. Overcrowding can steam the food instead of roasting it.

5. 5. Initial Roasting Phase: Place the baking sheet(s) in the preheated oven and roast for 15 minutes. This initial roasting time allows the vegetables to start softening and the chicken to begin cooking through.

6. 6. Apply Sauces and Finish Roasting: After 15 minutes, carefully remove the baking sheet from the oven. Drizzle the BBQ sauce and ranch dressing evenly over the chicken and vegetables. Toss everything gently on the pan to coat. Return the baking sheet to the oven and continue roasting for another 10-15 minutes, or until the chicken is cooked through (internal temperature reaches 165 F (74 C)) and the vegetables are tender-crisp and slightly caramelized. The sauces should be bubbly and slightly thickened.

7. 7. Serve and Garnish: Once cooked, remove the sheet pan from the oven. Let it rest for a few minutes before serving. Garnish with fresh chopped parsley or chives, if desired, for a pop of color and freshness. Serve hot and enjoy your flavorful, healthy meal!