Preheat the oven to 375 degrees. Coat a pie dish with cooking spray. Peel then shred the two potatoes onto 2 paper towels; add another two paper towels to the top and press all the liquid out of the potatoes. Smash the shredded potatoes all over the bottom and sides of the pie pan, making sure to press them firmly. Spray with cooking spray and season with sea salt, freshly cracked pepper, and garlic powder, to taste. Bake in the oven for 12-13 minutes. Remove from oven and set aside.
Sprinkle the diced tomato, spinach, red onion, and half of the feta cheese on top of the potatoes Beat the eggs with the milk and season with dill, sea salt, and freshly cracked pepper. Pour the egg mixture on top of the veggies then top with the remaining feta cheese.
Place into the oven and bake for 35-40 minutes or until a tester inserted in the center of the quiche comes out clean – don’t overcook. Remove from oven and let cool for a few minutes before slicing. Enjoy.