Preheat oven to 350°F. Line a baking sheet with parchment. 

Caramelize onions in a large saute pan, lightly coated with evoo, over medium high heat until dark brown, very soft and fragrant. Add garlic, harissa, cinnamon, cumin, salt and pepper. Stir to combine and transfer mixture to a large mixing bowl.

Add chicken broth, oats, egg yolks and ground chicken. Mix thoroughly without pressing too hard or the meatloaf will be tough. 

Pile meat onto lined baking sheet and form into a loaf shape. 

Roast meatloaf until a thermometer, inserted, registers 150°F. About 40-50 minutes. 

Cool slightly before slicing.