Preheat oven to 425°F. Line an extra-large baking sheet with foil (if desired for easy cleanup) and spray with nonstick cooking spray or coat with oil.
On the prepared pan or in a separate bowl, toss together the chicken and 2 tablespoons of olive oil. Add the flour, paprika, 1 teaspoon of the onion powder, and 1 teaspoon of the garlic powder to the chicken; toss to coat. Season with salt and pepper; toss again. Arrange the chicken in a single layer on one side of the baking sheet. Arrange the zucchini on the other side of the pan, drizzle with the remaining 1 tablespoon of olive oil, and toss to coat. Season the zucchini with salt and pepper to taste. Bake for 15 minutes, or until the chicken is cooked through and no longer pink in the center.
Meanwhile, whisk together the Catalina dressing, the orange marmalade, the remaining ¼ teaspoon onion powder, the remaining ¼ teaspoon of garlic powder, and a little bit of salt and pepper to taste.
Drizzle the orange marmalade glaze over the chicken; toss to coat. Give the zucchini a stir. Return the pan to the oven and bake for about 5-10 more minutes, until the glaze on the chicken starts to caramelize and the zucchini is tender. For a really crispy, charred finish, place the pan under the broiler for 1-2 minutes instead (don’t place the tray under the broiler if you use parchment paper to line the pan – it can catch on fire). If it’s under the broiler, watch the tray closely because the sauce can burn quickly. Garnish with fresh herbs or sliced green onions and serve!