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– **1 ½ cups whole milk** (or a mix of milk and heavy cream for extra richness)
– **Salt and pepper**, to taste
– **1 teaspoon fresh thyme** (or ½ teaspoon dried thyme)
– **1 tablespoon fresh parsley**, chopped (optional, for garnish)
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### Instructions: How to Make Mushroom and Gruyère Croissant Breakfast Casserole
#### 1. **Prepare the Croissants**
Start by cutting the **croissants** into large cubes. If your croissants are fresh, allow them to sit out for a few hours to dry out slightly. This helps them absorb the egg mixture without becoming too soggy. Once cubed, set them aside in a large mixing bowl.
#### 2. **Sauté the Mushrooms and Onion**
In a large skillet, heat the **olive oil** over medium heat. Add the **sliced mushrooms** and **diced onion**, and sauté for about 5-7 minutes, or until the mushrooms have released their moisture and the onions are soft and golden. Season with a pinch of **salt** and **pepper**, and stir in the **fresh thyme**. Once cooked, remove from the heat and set aside to cool slightly.
#### 3. **Prepare the Egg Mixture**
In a separate bowl, whisk together the **eggs** and **milk** (or cream). Add **salt** and **pepper** to taste. If you like a bit more flavor, you can also add a pinch of nutmeg or a dash of hot sauce to spice things up.
#### 4. **Assemble the Casserole**
Preheat your oven to **350°F (175°C)** and lightly grease a 9×13-inch baking dish. Layer the bottom of the dish with the cubed croissants, ensuring they are evenly distributed. Next, sprinkle the sautéed **mushrooms and onions** over the croissants. Top with a generous portion of **shredded Gruyère cheese**, ensuring it’s spread out evenly.
#### 5. **Pour the Egg Mixture Over the Croissants**
Pour the egg and milk mixture evenly over the croissant, mushroom, and cheese layers, making sure everything is well-coated. Press the mixture down gently with a spatula to ensure the croissants absorb the egg mixture. If needed, cover the casserole with plastic wrap and refrigerate it for 30 minutes to an hour to allow the croissants to soak up the custard for a richer texture (this step is optional but recommended for a creamier result).
#### 6. **Bake the Casserole**
Place the casserole in the preheated oven and bake for **30-40 minutes**, or until the top is golden brown and the eggs are set in the center. You can check if it’s done by inserting a knife into the center—if it comes out clean, the casserole is ready.
#### 7. **Serve and Garnish**
Once baked, remove the casserole from the oven and let it rest for 5-10 minutes before serving. Garnish with freshly chopped **parsley** for a pop of color and a touch of freshness.
### Tips for the Perfect Mushroom and Gruyère Croissant Breakfast Casserole
– **Make Ahead**: This casserole can be prepared the night before, making it an excellent option for busy mornings or when hosting guests. Simply assemble the casserole, cover it with plastic wrap, and refrigerate overnight. In the morning, just pop it in the oven for a hassle-free breakfast.
– **Add More Veggies**: For an extra dose of vegetables, consider adding spinach, bell peppers, or even roasted tomatoes to the casserole. These additions will add more color and nutrition while complementing the mushrooms and Gruyère.
– **Customize the Cheese**: If you’re not a fan of Gruyère, you can swap it for other cheeses like sharp cheddar, fontina, or mozzarella. A mix of cheeses can create a more complex flavor profile.
– **Include Meat**: If you want to make this casserole even heartier, add cooked bacon, sausage, or ham to the mushroom and croissant layers.
– **Serve with a Side**: This casserole is rich and filling on its own, but you can serve it alongside a light salad or fresh fruit to balance out the flavors.
### Why Mushroom and Gruyère Croissant Breakfast Casserole is a Must-Try
This **Mushroom and Gruyère Croissant Breakfast Casserole** is the epitome of breakfast indulgence. It takes the humble croissant to new heights by pairing it with earthy mushrooms, creamy Gruyère cheese, and a savory egg mixture, creating a dish that’s both satisfying and flavorful. The blend of textures—from the soft, custard-like interior to the golden, crisp top—is simply irresistible.
What’s more, it’s a dish that works for a variety of occasions. Whether you’re preparing a cozy brunch for your family, entertaining guests over the holidays, or simply enjoying a special morning with loved ones, this casserole is sure to impress. Its warm, comforting flavors make it a breakfast dish everyone will rave about.
### Conclusion: A Breakfast to Remember
For a breakfast that’s both indulgent and comforting, the **Mushroom and Gruyère Croissant Breakfast Casserole** is a must-try. It combines the best of buttery croissants, savory mushrooms, and melted cheese into a hearty casserole that will quickly become a favorite in your breakfast rotation. Easy to make, customizable, and delicious, it’s the perfect dish to elevate your mornings and create lasting memories around the table.
So, next time you’re in the mood for a decadent breakfast or brunch, remember this recipe—it’s guaranteed to delight.
