This breakfast casserole is loaded with vibrant vegetables, cheese, and eggs, making it a perfect start to your day or a great brunch dish.
Feel free to customize the vegetable selection based on seasonal availability or personal preference; bell peppers, zucchini, and mushrooms work particularly well. For added flavor, consider roasting the vegetables before adding them to the casserole. If you prefer a protein boost, incorporate cooked sausage or bacon. Use day-old bread to ensure it absorbs the custard without becoming soggy. For a gluten-free option, substitute the bread with cubed potatoes or gluten-free bread. Cheese selection is flexible—sharp cheddar, Monterey Jack, or feta can offer different flavor profiles. To enhance the dish's depth, sprinkle a dash of smoked paprika or a pinch of nutmeg into the egg mixture. For a dairy-free version, swap out dairy milk for almond or oat milk and use nutritional yeast instead of cheese. To save time in the morning, prepare the casserole the night before, cover, and refrigerate; then bake fresh in the morning. Ensure the casserole is completely set and golden on top before removing it from the oven. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days and are easily reheated in the oven or microwave.