Creating a Breakfast Casserole is simple if you follow these steps:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C).

2. Prepare the Dish: Grease a 9×13-inch baking dish with cooking spray or butter.

3. Whisk Eggs and Milk: In a large bowl, whisk together the eggs and milk until well combined.

4. Add Seasonings: Stir in salt and pepper to the egg mixture.

5. Combine Ingredients: Add the cooked sausage or bacon, diced vegetables, and shredded cheese to the egg mixture. Stir until evenly distributed.

6. Pour Into Dish: Pour the mixture into the prepared baking dish, spreading it evenly.

7. Bake: Place the dish in the preheated oven and bake for 30-35 minutes, or until the eggs are set and the top is lightly golden.

8. Cool: Once done, remove the casserole from the oven and let it cool for a few minutes before slicing.

9. Serve: Cut into squares and serve warm.

By following these simple steps, you can easily create a delightful Breakfast Casserole that will impress everyone at the table!