California Grill has fantastic flatbreads & I had one of my favorite WDW desserts there as well (Blueberry Bliss)
My other favorite WDW dessert was the Strawberry Rhubarb Cobbler at Narcoossees (altho it was really a crisp, not a cobbler)
Even tho I didn't love the entree at Chefs , the desserts were outstanding. If I ever went there again, I would order just cheese & dessert.
Boulangerie Pastisserie has wonderful desserts all day long, esp. the Pralineige.