Preheat the oven to 350°F (175°C) and generously grease a 9-inch pie plate or ceramic baking dish.
In a large mixing bowl, whisk the eggs until the yolks and whites are fully incorporated.
Stir in the cottage cheese, shredded cheddar, and grated Parmesan until combined.
Incorporate the dried spinach into the egg mixture, ensuring clumps are broken up and the vegetable is evenly distributed.
Season the mixture with salt, black pepper, garlic powder, and nutmeg; stir once more to combine.
Pour the batter into the prepared baking dish, smoothing the top with a spatula.
Bake in the center of the oven for 35 to 40 minutes, or until the center is firm to the touch and the top is lightly golden.
Remove from the oven and allow the quiche to rest for 10 minutes before slicing to ensure it holds its shape.