Sausage and Mushroom Breakfast Casserole

Start your morning right with this hearty and flavorful Sausage and Mushroom Breakfast Casserole! Packed with savory breakfast sausage, earthy white mushrooms, and a melty layer of sharp cheddar cheese, this dish is the ultimate comfort food to kick off your day. The combination of fluffy eggs, cubed day-old bread, and a touch of ground mustard for depth makes for a perfectly golden, custardy casserole that’s both filling and bursting with flavor. Ideal for weekend brunch, holiday mornings, or meal prep, it’s easy to make and serves a crowd in just over an hour. Whether you’re hosting guests or treating your family, this make-ahead breakfast casserole is sure to become a new favorite.

Nutriscore Rating: 61/100

Prep Time:20 mins

Cook Time:50 mins

Total Time:70 mins

Servings: 6

Ingredients

• 1 pound breakfast sausage
• 8 ounces white mushrooms
• 1 medium onion
• 2 cloves garlic
• 8 pieces large eggs
• 1.5 cups whole milk
• 1 teaspoon salt
• 0.5 teaspoon black pepper
• 0.5 teaspoon ground mustard
• 2 cups sharp cheddar cheese, shredded
• 4 cups day-old bread, cubed
• 1 tablespoon butter (for greasing the baking dish)

Directions

Step 1

Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish with butter and set aside.

Step 2

In a large skillet over medium heat, cook the sausage until browned and fully cooked, breaking it into small pieces as it cooks. Transfer the cooked sausage to a plate lined with paper towels to drain excess grease.

Step 3

In the same skillet, add the mushrooms and cook for 4-5 minutes until they release their moisture and become golden brown. Remove from the skillet and set aside.

Step 4

Dice the onion finely and mince the garlic. Add them to the skillet and sauté until the onion is translucent and fragrant, about 3 minutes. Remove from heat.

Step 5

In a large mixing bowl, whisk together the eggs, milk, salt, pepper, and ground mustard.

Step 6

Stir in the shredded cheddar cheese, cooked sausage, mushrooms, onion, and garlic.

Step 7

Gently fold the cubed bread into the egg mixture, ensuring all the bread is soaked in the mixture.

Step 8

Pour the mixture into the prepared baking dish, spreading it out evenly.

Step 9

Bake uncovered in the preheated oven for 45-50 minutes, or until the casserole is golden brown on top and a knife inserted into the center comes out clean.

Step 10

Let the casserole cool for 5-10 minutes before serving. Slice into squares and enjoy!

Nutrition Facts

Serving size	(2808.8g)

Amount per serving	% Daily Value*
Calories	5965.4

Total Fat 303.7g	0%
Saturated Fat 128.5g	0%
Polyunsaturated Fat 0.4g
Cholesterol 2080.9mg	0%
Sodium 13298.0mg	0%
Total Carbohydrate 546.0g	0%
Dietary Fiber 36.8g	0%
Total Sugars 61.3g
Protein 269.5g	0%

Vitamin D 538.2IU	0%
Calcium 3052.7mg	0%
Iron 46.6mg	0%
Potassium 4271.8mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 45.6%

Protein: 18.0%

Carbs: 36.4%