Start your day right with this Savory Mushroom & Spinach Breakfast Casserole. Packed with earthy mushrooms and vibrant spinach, it's the perfect hearty breakfast dish to share with family and friends. Easy to prep and bake, it's a flavorful, nutrient-rich way to kick off your morning.
Eggs are the backbone of the casserole, providing structure and protein. The whole milk adds creaminess without overpowering the eggs. A sharp cheddar cheese brings richness and a bit of tang, while the nutty Parmesan cheese on top gives a crispy, savory finish.
Olive oil serves as the cooking medium, enhancing the flavor of the onions and mushrooms as they cook. Spinach adds vibrant color and nutrients, and the whole grain bread cubes soak up the egg mixture, providing a satisfying, hearty texture.
Seasonings like salt, black pepper, garlic powder, and onion powder ensure the casserole is well-flavored throughout without overwhelming any single ingredient.
This casserole pairs wonderfully with a fresh fruit salad for some added sweetness. If you're serving brunch, consider a crisp side salad with a light vinaigrette to balance the richness of the dish. A dollop of Greek yogurt on the side can also provide a refreshing contrast.
First, preheat your oven to 350°F (175°C) so it's ready when you are. Heat a tablespoon of olive oil in a large skillet over medium heat. Once hot, toss in the diced onions and sauté them until they're soft and translucent, which should take about 5 minutes.
Next, add the chopped mushrooms to the skillet. Let them cook until they release their moisture and start to brown, stirring occasionally to ensure even cooking. This should take another 5–7 minutes. Stir in the fresh spinach leaves, cooking until they're just wilted — about a minute or so. Remove everything from the heat.
In a large mixing bowl, whisk together the eggs, milk, salt, pepper, garlic powder, and onion powder until well combined. Gently fold in the shredded cheddar cheese and cubed bread, making sure each piece of bread is coated with the egg mixture.
Add the sautéed vegetables to the egg and bread mixture, folding everything together until evenly distributed. Pour this mixture into a greased baking dish, spreading it out so it’s even. Sprinkle the top with grated Parmesan cheese for a deliciously crispy, cheesy crust.
Place the baking dish in your preheated oven and bake for 30–35 minutes. You’ll know it’s done when the casserole is set in the middle, and the top is a lovely golden brown. Let it cool slightly before slicing and serving.
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