Preheat oven to 425°F. Line a sheet pan with parchment paper and lightly oil it.
In a large bowl, combine ground chicken, grated onion, garlic, herbs, and all spices. Drizzle in olive oil to help keep the mixture moist. Mix gently with your hands — do not overwork.
With damp hands, form the chicken mixture into long oval or log shapes, about 1 inch thick. (You can form them around skewers if desired, but it’s not necessary for sheet-pan cooking.)
Arrange kebabs on the prepared sheet pan, leaving space between each. Bake for 15–18 minutes, flipping once halfway through, until cooked through and lightly browned.
For extra char, broil the kebabs for 2 minutes at the end.
Transfer to a platter and serve with warm pita, yogurt sauce, and a fresh salad. They’re juicy straight from the oven and reheat beautifully for meal prep.