Preheat oven to 425°F/ 210°C. Spray or brush a jelly roll pan with oil, or line with foil and brush the foil with oil, then set aside.
Place a fine mesh strainer over a large bowl.
In the bowl of your food processor, add onions, bell pepper, garlic and parsley. Pulse until everything is finely chopped.
Transfer the mixture into the fine mesh strainer and press with the back of a spoon to squeeze most of the juices out. Do not discard that water, we will use it later.
Place the squeezed mixture into a large bowl, add meat, spices and mix everything well.
Spread the mixture evenly on the baking sheet, Using a sharp knife cut long vertical lines.
Dip the handle of a wooden spoon, or spatula, into the juices that we squeezed earlier and make small indentation in each one to give it that restaurant look.
Drizzle the top of the kebab with olive oil and bake in the middle of the oven for 12-15 minutes.
Carefully take the sheet pan out and get rid of the accumulating liquid and separate the kebabs with a knife or spatula.
Return to oven and broil for 3-4 minutes or until lightly charred.
Serve with salad, tahini or yogurt garlic sauce as a wrap or rice.