Preheat your oven to 425 degrees Fahrenheit. If you have a convection setting, feel free to use it, but it's not necessary to adjust the temperature. Line a baking sheet with aluminum foil for easier cleanup; trust me, it makes a world of difference when it comes to washing up!
In a large mixing bowl, combine the chicken, red onion chunks, and mushrooms with the stem side facing up. Adding the zucchini to the mix gives it a fresh flair. Drizzle everything generously with olive oil to ensure even roasting.
Season the mixture with paprika, dried oregano, kosher salt, and black pepper. Use your hands to toss everything together, ensuring each piece of chicken and vegetable is coated evenly with the oil and spices.
Spread the chicken and vegetables out in a single layer on the baking sheet. It’s important not to overcrowd the pan; this allows the chicken to roast properly and develop that beautiful golden color.
Place the baking sheet in the oven and bake for about 20 minutes. Keep an eye on it as the cooking time may vary depending on your oven. You want the chicken to be cooked through but still juicy, and the vegetables to be tender.
Check the internal temperature of the chicken; it should read at least 165 degrees Fahrenheit. If using a convection oven, consider rotating the baking sheet halfway through cooking to ensure even roasting.
Once done, remove the baking sheet from the oven and let it sit for a minute or two. This will allow the flavors to settle.
If desired, garnish with freshly minced parsley. It adds a lovely fresh touch that makes the dish even more appealing.
Serve immediately, and enjoy every last bite of your Skinny Sheet Pan Chicken with Mushrooms and Onions!