Looking for a breakfast dish that feels like a warm hug? This Savory Herb and Mushroom Breakfast Casserole combines earthy mushrooms, vibrant herbs, and wholesome bread in a comforting, satisfying dish. Perfect for leisurely weekends or feeding a crowd!
Eggs are the backbone, providing structure and protein. Whole milk adds richness and creaminess to the mix. Cremini mushrooms bring a deep, umami flavor that elevates the dish. Diced onions and garlic are sautéed for a sweet and aromatic base. Sharp cheddar cheese gives a tangy, melty finish. Fresh spinach adds a pop of green and nutrients. Sun-dried tomatoes contribute a sweet-tart depth. Fresh basil provides an aromatic herbaceous note. Olive oil is used to sauté, bringing a subtle fruitiness. Seasonings like salt, black pepper, dried thyme, and red pepper flakes round out the flavors, while whole-grain bread absorbs the custard, making the casserole hearty.
This casserole pairs beautifully with a simple arugula salad lightly dressed with lemon and olive oil. The peppery greens complement the rich, savory casserole perfectly. A side of fresh fruit or a light smoothie also makes for a refreshing contrast.
Start by preheating your oven to 350°F. This gives you time to prep everything else while the oven gets up to temperature. Heat a large skillet over medium heat and add the olive oil. Once shimmering, toss in the onions and garlic and sauté until the onions are translucent, which should take about 3-4 minutes.
Next, add the mushrooms. You want to cook them until they're browned and any liquid has cooked off. This step is crucial for concentrating their flavor. Give it about 5-7 minutes, stirring occasionally. Then, stir in the spinach, sun-dried tomatoes, basil, and the seasonings: salt, black pepper, thyme, and red pepper flakes. Just a couple of minutes to meld the flavors, then set it aside to cool slightly.
Meanwhile, in a large bowl, whisk together the eggs and milk until they're fully combined. This is your custard base. Add the slightly cooled mushroom mixture, cubed bread, and cheese. Gently fold everything together, ensuring the bread is well saturated but not crushed.
Transfer this mixture into a greased 9x13 inch baking dish, spreading it out into an even layer. Pop it in your preheated oven and bake for 40-45 minutes. You’re looking for a golden brown top and a set center. Once it’s out, let it cool for a few minutes before diving in.
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