Season chicken with salt and pepper. In a large skillet, heat oil over medium-high. In batches, cook chicken, skin side down, until skin is golden brown, about 4 minutes.
Combine onion, garlic, and thyme in a 5-to-6-quart slow cooker and season with salt and pepper. Top with chicken, skin side up, in a tight layer. In a small bowl, whisk together wine and flour until smooth and add to slow cooker. Cover and cook on high until chicken is tender, about 3 1/2 hours (or 7 hours on low). Cook couscous according to package instructions. Serve chicken and sauce over couscous, sprinkled with parsley.
Oven Instructions: In a large Dutch oven, brown chicken as in step 1, then add remaining ingredients, plus 1 cup low-sodium chicken broth or water. Cover and cook at 350 degrees until chicken is cooked through and tender, about 40 minutes.
I made this and I really liked it. My husband liked it even more. I used 4.5 lbs of chicken and added some canned mushrooms (without the juice). When I made the couscous, I added nutmeg and golden raisons. I would also reduce the sauce in the future, but didn't and it was still pretty good!
I made this tonight and didn't substitute anything, I followed the recipe to the letter. I was disappointed with this recipe and would cut the thyme by more than half if I were to make again. Also, I would reduce the browned bits from the pan with wine and add that to the slow-cooker for added flavor. I will most likely not make this again.