Preheat oven to 375 degrees F and spray 9" pie dish with cooking spray. Set aside.
In a large bowl, add shredded sweet potatoes, eggs, cottage cheese, cheddar cheese, green onion, flour, onion powder, garlic powder, smoked paprika, chili powder, salt and pepper. Stir with spatula until well combined.
Transfer mixture to previously prepared baking dish and bake for 55 minutes or until it's no more jiggly in the middle.
Remove from the oven and let cool on a wire rack for about 2 hours. Loosen the edges with spatula and cut into 8 slices. Enjoy warm or cold (I love cold quiche!).
Video
Notes
Store: Refrigerate leftovers covered for up to 5 days.
Freeze: In an airtight container for up to 3 months. Unsliced quiche will stay more moist. Slices are easier to thaw but use faster.
Reheat quiche? I love mine cold. It is so good! If you must, I recommend a microwave otherwise it will dry out in the oven.
Air fryer: Line air fryer basket with unbleached parchment paper and spray well with cooking spray. Add mixture, level with spatula and bake in preheated air fryer to 320 F degrees for 30 minutes. Do toothpick test in the center for doneness.