Preheat oven to 350 degrees F.
Coat an 8 x 8-inch baking dish with cooking spray, then coat with sesame seeds. Fill a large bowl with ice and water; set aside. Bring a large pot of water to a boil. Add spinach; blanch until bright green, approximately 8-10 seconds. Transfer hot spinach to the ice bath to cool for 30 seconds, remove and drain water. Set aside spinach on a paper towel.
Heat olive oil in a medium skillet. Add shallot, garlic, thyme and chili powder; sauté until translucent, approximately 8-10 minutes. Remove from heat; transfer to a medium-sized bowl.
Add spinach, cooked quinoa, Ile de France Brie cheese, eggs, sea salt and pepper to the onion mixture; mix well to combine. Transfer quinoa mixture into the prepared baking dish and place in the oven. Bake until set and golden brown, approximately 60 minutes.
Remove from oven. Slice, and serve warm or at room temperature.