1. Preheat the oven to 350°, then peel and slice sweet potatoes. I sliced mine using a mandoline, but a knife works great as well. The mandoline speeds up the process significantly and gives you even slices. Coat a pie dish with cooking spray, then fill the bottom of the dish with a layer of sweet potato slices. Cut the sweet potato rounds in half and fill around the edges of the pie dish; round side facing up. Once the entire dish is filled, coat one more time with cooking spray. Bake for 20 minutes. Turn heat up to 375°.
2. For the filling, heat a nonstick skillet over medium heat. Add spinach; sauté 3 minutes. Remove from heat; cool.
3. Combine milk and next 5 ingredients in a bowl; stir with a whisk. Arrange spinach mixture in crust; pour egg mixture over spinach. Sprinkle with feta. Bake at 375° for 35 minutes. Let stand 5 minutes; cut into 4 wedges.
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