Preheat the oven to 350°F (175°C).
In a large bowl, beat the eggs and flour until smooth.
Stir in the grated Cheddar cheese, cottage cheese, thawed and drained chopped spinach, and salt until well combined.
Grease a 1-quart baking dish with non-stick cooking spray.
Pour the spinach mixture into the prepared baking dish, spreading it out evenly.
Bake the casserole in the preheated oven for 1 hour, or until the top is golden brown and the casserole is set.
Once baked, remove the casserole from the oven and let it cool for a few minutes before serving.
Serve the cheesy spinach delight casserole hot as a satisfying main course or side dish.