Preheat your oven to 180°C (350°F). Lightly grease a baking dish with a bit of oil or butter.
Cook the Potatoes:
Boil the sliced potatoes in salted water until just tender, about 5-7 minutes. Drain and set aside.
Sauté Vegetables:
In a skillet, heat a splash of oil over medium heat. Add the chopped onion and cook until translucent. Add the chopped spinach and cook until wilted. Season with garlic powder, salt, and pepper.
Prepare the Egg Mixture:
In a large bowl, beat the eggs with sour cream and baking powder. Stir in the grated cheese (save some for topping) and mix until well combined.
Assemble the Bake:
Layer half of the cooked potatoes in the prepared baking dish. Spread the spinach and onion mixture over the potatoes, then cover with the remaining potatoes. Pour the egg and cheese mixture evenly over the top, making sure it seeps into the layers.
Bake:
Sprinkle the remaining cheese on top. Bake in the preheated oven for about 25-30 minutes, or until the top is golden brown and the eggs have set.
Serve Hot:
Let the dish cool slightly before serving. This allows the layers to set, making it easier to slice.
