In a large bowl, whisk together the eggs, milk, garlic powder, onion powder, salt, and black pepper until smooth and well combined.
Step 5: Pour and Bake
Carefully pour the egg mixture over the layered casserole, ensuring it spreads evenly throughout the dish.
To Bake Immediately:
Bake uncovered for 35–40 minutes, until the center is set and the eggs are fully cooked.
To Make Ahead:
Cover tightly with foil and refrigerate for up to 24 hours. When ready to bake, cook as directed, adding an extra 5–10 minutes if baking straight from the refrigerator.
