Creating Sheet Pan Chicken Pitas with Herby Ranch is straightforward when you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 400°F (200°C).
2. Prepare the Chicken: In a bowl, combine olive oil, garlic powder, onion powder, paprika, cumin, salt, and pepper. Add the chicken breasts and coat them well in the marinade. Let it sit for about 10 minutes.
3. Prepare the Vegetables: On a sheet pan, spread out the sliced bell peppers and red onion. Drizzle with olive oil and season with salt and pepper. Toss to coat evenly.
4. Add Chicken: Place the marinated chicken breasts on the same sheet pan with the vegetables.
5. Bake: Place the sheet pan in the preheated oven and bake for 20-25 minutes, or until the chicken is cooked through and the vegetables are tender.
6. Prepare the Herby Ranch: While the chicken and vegetables are baking, mix the ranch dressing with chopped parsley, dill, and lemon juice in a small bowl. This will create a fresh herby ranch sauce.
7. Assemble the Pitas: Once the chicken is done, remove it from the oven. Let it rest for a few minutes, then slice the chicken into strips.
8. Fill the Pitas: Open each pita and fill it with a generous amount of the roasted vegetables, sliced chicken, cherry tomatoes, and spinach.
9. Drizzle Sauce: Drizzle the herby ranch sauce over the filled pitas for added flavor.
10. Serve: Enjoy your delicious Sheet Pan Chicken Pitas with Herby Ranch immediately!