Now let’s get into the nitty-gritty of making this amazing egg casserole. Follow these simple steps for a delicious outcome:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Baking Dish: Grease a 9×13 inch baking dish with olive oil or butter.
3. Sauté Vegetables: In a skillet, heat a bit of olive oil over medium heat. Sauté the diced onion and peppers until soft. Add the chopped spinach or kale and cook until wilted. Set aside.
4. Mix Eggs and Milk: In a large bowl, whisk together the eggs and milk until well combined. Season with garlic powder, salt, and pepper.
5. Combine Ingredients: Add the sautéed vegetables and meats (if using) to the egg mixture. Stir to combine fully.
6. Add Cheese: Fold in the shredded cheese, ensuring it’s evenly distributed throughout the mixture.
7. Pour into Dish: Pour the egg mixture into the prepared baking dish, spreading it out evenly.
8. Bake: Place the dish in the preheated oven and bake for 30-40 minutes, or until the egg is set and slightly golden on top.
9. Cool and Serve: Once done, let it cool for about 5 minutes before slicing and serving.

These steps are simple to follow, making it easy for anyone to whip up a delightful egg casserole.