Mix the seasoning ingredients together.
Preheat the oven to 375F.
Small chop the sun-dried tomatoes and place in the bottom of the tagine, along with the potatoes, olives, preserved lemon, and garlic. Sprinkle lightly with some of the seasoning mix, tossing to coat, and pour the stock into the tagine (along the outside so the seasoning doesn't rinse off.)
Liberally sprinkle the cut up chicken pieces with the seasoning and sear off in a frying pan. Place on top of the vegetables.
Add the lid to the tagine and place in the oven, baking for 90 minutes.