Overnight Veggie & Cheese Casserole: A Savory Breakfast Casserole That Wows Everyone

Ever hosted a brunch potluck and ended up microwaving sad, frozen eggs? I feel you. That’s why this Overnight Veggie & Cheese Casserole rescues you from the blah breakfasts. I stumbled on this recipe when I needed Breakfast Ideas For A Crowd; it doubled as a Healthy Breakfast Casserole and a total crowd-pleaser. And yes, it’s an epic Breakfast Casserole Make Ahead dream.

If you hate juggling pans and timers, you’ll love that this is a Breakfast Casserole Overnight magic: just prep, refrigerate, and bake next morning. I’m not kidding—I once prepped this while binge-watching and woke up feeling like the menu genius of a Tortilla Quiche Bake trifecta. This dish ticks the Easy Breakfast Ideas box big time, giving you savory breakfast vibes without the chaos.

In the past, I’ve tried crafting a breakfast casserole basket with muffins, granola, and way-too-healthy smoothies, only to find myself starving at 10 AM. This savory breakfast casserole solves that by combining protein-packed eggs, fiber-rich veggies, and gooey cheese in one glorious bake. Ever wondered why everyone raves about Easy Breakfast Casserole With Hashbrowns? It’s the simplicity—no standing in front of the stove flipping an Omlet Breakfast Ideas creation for every guest (seriously, who has time for that?).

This recipe even nods to my love for Mini Quiche Recipes and Overnight Breakfast Casserole With Hashbrowns, because I swapped the mini muffin tin for one family-sized dish. And if you’re a fan of Easy Tater Tot Casserole, just imagine adding crispy tots on top. Dream combo, right? FYI, this is one of my favorite Egg Casserole Recipes—IMO, it rivals any Egg Frittata or Brunch Casserole you’ve tried. Ready to save your mornings and upgrade your Breakfast Ideas Casserole? Let’s get cooking! 🙂

Ingredients

• 8 large eggs
• 1 cup whole milk (or half-and-half for extra creaminess)
• 2 cups shredded cheddar cheese (or a Mexican blend)
• 1 cup diced bell peppers (mixed colors for a festive look)
• 1 cup chopped spinach or kale
• ½ cup chopped red onion
• 2 cloves garlic, minced
• Salt and pepper, to taste
• 1 tsp paprika or smoked paprika
• Optional: 1 cup frozen hash browns or tater tots for extra crunch
• Optional: ½ cup diced ham, cooked sausage, or crumbled bacon
• Nonstick cooking spray or butter for greasing

Instructions

1. Grease a 9×13-inch baking dish with nonstick spray or butter.
2. In a large bowl, whisk together the eggs and milk until smooth.
3. Stir in the shredded cheese, diced peppers, spinach, onion, and garlic.
4. Season with salt, pepper, and paprika. Mix well.
5. If you want to channel that Easy Breakfast Casserole With Hashbrowns vibe, fold in the frozen hash browns or layer tater tots on top.
6. Cover the dish tightly with plastic wrap and refrigerate for at least 6 hours—or overnight for best results.
7. Preheat your oven to 350°F (175°C) about 30 minutes before baking.
8. Remove plastic wrap, bake uncovered for 45–50 minutes, or until the center sets and the top turns golden.
9. Let it rest for 5 minutes—this helps everything firm up so you can slice neat squares.
10. Serve warm and watch your guests marvel at how you nailed both Breakfast Ideas For A Crowd and a Brunch Potluck showstopper.

Variations

Want to switch things up? Here are a few creative spins on this casserole:
Southwestern Style: Swap bell peppers for diced green chiles and top with crushed tortilla chips and fresh cilantro post-bake.
Veggie Fiesta: Stir in zucchini ribbons, cherry tomatoes, and crumbled feta for a Mediterranean twist.
Meat Lovers: Add cooked chorizo or diced roast chicken. You’ll feel like you’re biting into the best Brunch Casserole ever. These variations transform our core recipe into anything from an irresistible Breakfast Basket centerpiece to a hearty Tortilla Quiche Bake alternative. Feel free to riff on spices—cumin, curry powder, or Italian seasoning all work wonders here.

Serving & Tips

Slice this casserole into squares and serve with a dollop of salsa, a sprinkle of fresh herbs, or even avocado slices for a dreamy Healthy Breakfast Casserole upgrade. It pairs perfectly with fresh fruit salad or a green side to balance the richness.
To store leftovers, cover the dish tightly or transfer slices to an airtight container. Refrigerate up to 4 days or freeze portions for up to 2 months—just thaw overnight in the fridge before reheating.
If you want to impress at your next Brunch Potluck, pop individual slices into a mini muffin tin and bake at 350°F for 10 minutes to create adorable mini quiche bites—no one will guess they started as a sheet-pan casserole.
Pro tip: line the baking dish with parchment paper for easy lifting and cleanup. And remember, you can totally swap in gluten-free bread cubes, go dairy-free with almond milk and vegan cheese, or amp it up taco-style with salsa layers. Your breakfast future never looked so bright!

Final Thoughts

I started making this Overnight Veggie & Cheese Casserole years ago when I needed a foolproof Breakfast Casserole Make Ahead for holiday mornings. It’s stood the test of time, from sleepy weekend breakfasts to emergency brunch rescues. IMO, this is the ultimate answer to “What’s for breakfast?”—and it’s shockingly easy to adapt. Whether you keep it simple or go wild with toppings, this recipe proves that you don’t need to sacrifice flavor for convenience. Now every time I open the fridge, I grin knowing there’s a crowd-pleasing, savory slice waiting. Give it a try—you might just retire your waffle iron for good. 😉

FAQs

Can I make this casserole dairy-free?

Absolutely! Swap the whole milk for your favorite dairy-free alternative (almond, oat, or soy). Use dairy-free cheese or omit it and sprinkle nutritional yeast on top for a cheesy flavor.

How do I reheat overnight casserole slices?

Pop individual slices in the microwave for 1–2 minutes or reheat in a 350°F oven for 10–12 minutes. If frozen, thaw in the refrigerator overnight before reheating.

Can I prep this casserole without refrigerating overnight?

You can bake it immediately, but chilling for at least 2 hours helps flavors meld and gives you cleaner slices. Overnight refrigeration yields the best texture and ease of serving.

Is this recipe freezer-friendly?

Yes! Wrap cooled slices in parchment and foil, then freeze in an airtight container up to 2 months. Thaw overnight in the fridge, then reheat.

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