Heat the oven to 350°F (175°C). Grease a 9x13 baking dish.
Wilt the spinach in a large skillet over medium heat for 2 to 3 minutes. Let it cool slightly, then squeeze out as much liquid as you can in a clean towel or sieve.
Spread the squeezed spinach and half the cheddar evenly in the baking dish.
Blend the eggs, cottage cheese, salt, pepper and garlic powder for about 30 seconds, until smooth with no visible curds.
Pour the egg mixture over the spinach and sprinkle the remaining cheddar on top.
Bake for 35 to 40 minutes, until the center is set and a knife comes out clean (160°F). Rest 10 minutes, then cut into 8 slices.