I start by preheating my oven and prepping the veggies. Make sure the spinach is well-drained and the onion finely chopped so everything cooks evenly. This sets the stage for a smooth, creamy bake.
In a large bowl, I whisk the eggs and stir in the cottage cheese. This creates a fluffy base that turns soft and tender once baked. I add salt, pepper, and Parmesan at this stage for flavor balance.
Next, I fold in the spinach and onions until evenly distributed. This ensures every bite has a little bit of greens and sweetness. The mixture should look well-mixed but not over-stirred.
I pour the mixture into a greased baking dish and bake at 350°F (175°C) for about 25 minutes. The eggs puff up slightly and the top turns lightly golden. I let it cool a few minutes before slicing to hold its shape.