Maximalist Grilled Cheese Casserole

Name: Maximalist Grilled Cheese Casserole
Prep time: 20 min
Cook time: 35 min
Total time: 55 min
Cuisine: American
Ingredients: 12 slices thick-cut sourdough bread, crusts on; 1 1/2 cups shredded sharp cheddar cheese; 1 cup shredded Gruyère cheese; 1 cup shredded mozzarella cheese; 1/2 cup cream cheese, softened; 1 1/2 cups whole milk; 3 large eggs; 1 tablespoon Dijon mustard; 4 tablespoons unsalted butter, melted; 2 large heirloom tomatoes, sliced; 1 small red onion, thinly sliced; 6 strips cooked bacon, chopped (optional; omit for vegetarian); 1/2 cup baby spinach leaves; 1/4 cup chives or green onions, thinly sliced; 1 teaspoon garlic powder; 1 teaspoon smoked paprika; 1/2 teaspoon salt; 1/2 teaspoon black pepper

Author: Clara Hastings

Published: September 21, 2025

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Introduction to Maximalist Grilled Cheese Casserole

Picture this: a bustling weeknight, you’re tired, and dinner feels like a daunting task. Enter the Maximalist Grilled Cheese Casserole—your new best friend in the kitchen! This recipe wraps comfort and decadence into one delicious dish that’s sure to impress everyone around the table. Perfect for busy moms or professionals craving a quick yet delightful meal, this casserole is like a warm hug on a plate. With layers of gooey cheese and hearty ingredients, it’s not just food; it’s a moment to savor and share with loved ones. Let’s get cooking!

Why You’ll Love This Maximalist Grilled Cheese Casserole

The Maximalist Grilled Cheese Casserole is not just incredibly tasty; it’s also a time-saver! In just 55 minutes, you can create a dish that’s perfect for busy weeknights or surprise guests. The combination of cheeses and fresh veggies makes each bite unforgettable. Plus, the leftovers (if there are any!) taste even better the next day, providing a deliciously cozy breakfast or lunch option. It’s comfort food at its finest!

Ingredients for Maximalist Grilled Cheese Casserole

Gathering the ingredients for your Maximalist Grilled Cheese Casserole is half the fun! Let’s dive into this cheesy adventure:

Sourdough Bread: Thick-cut with crusts on for that desired texture. It holds up beautifully against all that cheesy goodness.
Sharp Cheddar Cheese: Adds a delightful tang. Its melty nature makes this casserole a dream come true.
Gruyère Cheese: Known for its nutty flavor, it elevates this dish and brings everything together like a warm embrace.
Mozzarella Cheese: For the ultimate gooeyness! It melts perfectly, pulling the dish into a cheesy masterpiece.
Cream Cheese: Softened and spreadable, it adds rich creaminess to balance out the bold flavors.
Whole Milk: Adds moisture, ensuring your casserole remains wonderfully sumptuous and flavorful.
Eggs: The secret glue! They bind everything together while providing custardy bites between the layers.
Dijon Mustard: A little zing! It brightens the flavors and adds that extra layer of depth.
Unsalted Butter: Melted and drizzled over the top for a golden, crispy finish that will leave you craving more.
Heirloom Tomatoes: Fresh and juicy, they provide bursts of flavor and color, making this dish even more appealing.
Red Onion: Thinly sliced for a subtle sweetness that complements the sharpness of the cheeses.
Bacon (optional): For those who crave a smoky crunch! You can easily give this dish a meaty boost—or leave it out for a vegetarian option.
Baby Spinach: Adds a pop of color and nutrients, it eases the guilt of indulging in such a rich dish.
Chives or Green Onions: A finishing touch! They provide a burst of freshness that uplifts the casserole.
Garlic Powder: For a savory aroma that makes your kitchen smell divine as it bakes.
Smoked Paprika: This brings a lovely smokiness, adding depth and warmth to each mouthful.
Salt and Black Pepper: Essential seasonings that amplify all the flavors and tie the dish together.

For the exact quantities needed to make this cheesy creation, scroll down to the bottom of the article, where you’ll find all the details ready for printing!

How to Make Maximalist Grilled Cheese Casserole

Now that we’ve got our ingredients ready, it’s time to dive into the fun part: making the Maximalist Grilled Cheese Casserole! Trust me; it’s as easy as pie—or should I say, casserole? Follow these simple steps, and you’ll be on your way to cheesy paradise in no time.

Step 1: Preheat the Oven

First things first—preheat your oven to 375°F. This ensures everything bakes evenly. While the oven warms up, grab your 9×13-inch casserole dish. Lightly grease it with butter or a nonstick spray. This will prevent the casserole from sticking and make cleanup a breeze.

Step 2: Prepare the Egg Mixture

In a large mixing bowl, it’s time for some whisking! Combine the eggs, whole milk, Dijon mustard, garlic powder, smoked paprika, salt, and black pepper. Whisk until everything is well mixed and creamy. This egg mixture will help hold your casserole together, so give it some love!

Step 3: Build the Base Layer

Now comes the fun part: layering! Start by arranging 6 slices of thick-cut sourdough bread at the bottom of the casserole dish. If needed, trim them to fit snugly. Then, evenly spread half of the softened cream cheese over the bread slices. Next, sprinkle half of the sharp cheddar, Gruyère, and mozzarella cheeses over this layer. Don’t forget to add half of the sliced tomatoes, red onion, spinach leaves, and bacon if you’re using it. Yum!

Step 4: Add the Second Layer

Let’s keep building! Repeat the layering with the remaining bread slices and any leftover ingredients. That means more cream cheese, cheese, tomatoes, onions, spinach, and bacon. This second layer adds a hearty, satisfying vibe to your casserole!

Step 5: Add the Egg Mixture

Once your layers are complete, it’s time to pour that glorious egg mixture over everything. Make sure it’s evenly distributed. Gently press down on the layers with a spatula. This helps the bread soak up the liquid, ensuring every bite is creamy and delicious.

Step 6: Bake the Casserole

Cover your casserole with aluminum foil. Pop it into the preheated oven and let it bake for about 25 minutes. After that, remove the foil to let the top crisp up. Bake for another 10 minutes, until everything is golden brown and bubbling. Your kitchen will smell divine!

Step 7: Cool and Serve

Once it’s finished baking, resist the urge to dig in immediately. Allow the casserole to rest for 5 to 10 minutes. This helps it set and makes slicing easier. When ready, cut into squares, serve warm, and enjoy the cheesy delight that is your Maximalist Grilled Cheese Casserole. Your family will be begging for more!

Tips for Success

Use day-old sourdough for better texture; it absorbs the custard mixture beautifully.
For a crispier top, broil it for a minute or two after baking. Just keep an eye on it!
Feel free to mix up the cheeses based on what you have on hand—goat cheese, feta, or pepper jack can add a fun twist.
Prep the casserole a day ahead and refrigerate for an easy stress-free meal.
Always let it rest before slicing; it helps maintain structure and makes serving easier.

Equipment Needed

9×13-inch Casserole Dish: Essential for baking your masterpiece. A big baking dish works too!
Mixing Bowl: For whisking the egg mixture. Any large bowl will suffice.
Whisk: Helps you blend your ingredients smoothly. A fork can do the trick in a pinch.
Spatula: Great for pressing down layers and serving. A wooden spoon can double as an alternative.
Aluminum Foil: Necessary for covering the casserole while it cooks. Parchment paper can be a solution too!

Variations of Maximalist Grilled Cheese Casserole

Vegetarian Delight: Omit the bacon and add extra vegetables, like bell peppers or zucchini, for a fresh twist.
Spicy Kick: Incorporate jalapeños or a sprinkle of red pepper flakes for heat that will tantalize your taste buds.
Herbed Up: Add fresh herbs such as basil or thyme to the egg mixture for a burst of herbal aroma and flavor.
Cheesy Swap: Experiment with different cheeses, like pepper jack for heat or blue cheese for boldness.
Low-Carb Option: Substitute the bread with cauliflower rice or zucchini slices for a lighter version.

Serving Suggestions for Maximalist Grilled Cheese Casserole

Simple Salad: Pair with a fresh green salad dressed in a light vinaigrette for a nice balance.
Tomato Soup: Serve alongside a warm bowl of creamy tomato soup for that classic comfort combo.
Chilled Beverages: Iced tea or a crisp white wine complements the rich flavors wonderfully.
Garnish: Top with extra chives or fresh herbs before serving for a pop of color.

FAQs about Maximalist Grilled Cheese Casserole

Got questions about your Maximalist Grilled Cheese Casserole? Here are some common inquiries, along with answers to guide you through your cheesy journey.

Can I prepare the casserole ahead of time?

Absolutely! Prep the casserole the night before and store it in the refrigerator. Just remember to add a few extra minutes to the baking time if it’s cold from the fridge.

What can I substitute for the sourdough bread?

While sourdough bread offers a superb texture, you can use challah or ciabatta for a different flavor. Just make sure it’s thick-cut!

Can I make this casserole dairy-free?

Yes! Substitute the cheeses with dairy-free alternatives and use plant-based milk for a tasty, dairy-free version of the Maximalist Grilled Cheese Casserole.

What do I do with leftovers?

Leftovers can be stored in an airtight container in the fridge for up to three days. Reheat in the oven for the best taste!

How can I make it spicier?

For a spicy twist, add diced jalapeños or sprinkle some red pepper flakes during the layering process for an extra kick!

Final Thoughts on Maximalist Grilled Cheese Casserole

The Maximalist Grilled Cheese Casserole is more than just a meal; it’s a joyous experience wrapped in layers of cheesy goodness. Each bite hugs your taste buds like a warm blanket on a chilly night, offering comfort and nostalgia. It invites both creativity and simplicity to the table, allowing you to experiment or follow the recipe as is. Whether you’re feeding a family or enjoying a cozy night in, this casserole brings everyone together. With its decadent flavors and easy prep, it’s destined to become a beloved staple in your kitchen!