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Preheat oven to 350 degrees F.
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Coat an 8 x 8-inch baking dish with cooking spray, then coat with sesame seeds.
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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.
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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.
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Add spinach, cooked quinoa, yogurt, 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.
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Remove from oven. Slice, and serve warm or at room temperature.