For the marinade, combine olive oil, garlic, lemon juice, rosemary, paprika, harissa, salt, and pepper in a zip-top bag. Seal and mix the ingredients together.
Add the cubed chicken. Refrigerate for at least 3 hours and up to 6 hours.
Cut up the peppers and onions. Toss in olive oil. Season with salt, pepper, and paprika and mix together. Bake in a 400° F oven for 18 minutes.
While the vegetables are roasting, pour the chicken and marinade into a sauce pan and cook on medium until chicken temperature is 165° F, about 8 to 10 minutes.
Layer the roasted vegetables over jasmine rice, then add the chicken and sauce. Finally add a dollop of Greek yogurt over the chicken, and garnish with parsley, sliced olives, and capers, if desired.
