Preheat the Oven: Start by preheating your oven to 350°F (175°C).
Prepare the Egg Mixture: In a large bowl, whisk together the eggs, milk, salt, pepper, and garlic powder until combined.
Add Spinach: Fold in the chopped spinach and half of the shredded cheese into the egg mixture.
Pour into Baking Dish: Grease a 9x9-inch baking dish and pour the egg mixture into it, spreading it evenly.
Top with Cheese: Sprinkle the remaining cheese on top for that extra cheesy goodness.
Bake: Bake for approximately 20-25 minutes, or until the center is set and the top is golden and bubbly.
Let it Cool: Once done, allow it to cool for a few minutes, then cut into squares, serve, and enjoy!