Mushroom & Swiss Breakfast Casserole


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5 from 1 vote

Mushroom and Swiss Breakfast Casserole

This tasty casserole layers easy pre-shredded hash brown potatoes with mushrooms, onions, and Swiss for a hearty take on everyone’s favorite potato pancakes.
Course: Breakfast, Brunch
Cuisine: American
Servings: 12 servings
Calories: 258kcal


  • Olive oil cooking spray
  • 4 onions thinly sliced
  • 4 8 oz packages sliced cremini mushrooms
  • 3 cloves garlic minced
  • 1 TB rosemary minced
  • 1 1/2 tsp kosher salt divided
  • ½ tsp black pepper
  • 1 20 oz package refrigerated hash brown potatoes
  • 2 cups shredded low fat Swiss cheese
  • 12 eggs
  • 1 ½ cups low fat milk
  • 2 TB grainy Dijon mustard
  • fresh chives for garnish


  • Coat a large nonstick skillet with olive oil cooking spray and heat over medium-high heat. Add onions, mushrooms, ½ tsp salt, and ¼ tsp pepper and cook for 10 minutes or until veggies are softened. Stir in garlic and rosemary and cook for an additional minute. 
  • Coat the inside of slow cooker with cooking spray. Place 1/3 potatoes in bottom, top with 1/2 veggie mixture and 2/3 cup cheese. Repeat with another 1/3 potatoes, remaining veggies, 2/3 cup cheese. Finish layering with remaining 1/3 cup potatoes. 
  • Whisk together eggs, milk, mustard, and remaining 1 tsp salt and ¼ tsp pepper. Pour over layers and top with remaining cheese. Cover and cook on low for 6-8 hours or until potatoes are softened. Serve topped with chopped chives.


Serve with: additional grainy mustard, hot sauce, and light sour cream for topping. Pair with chunky applesauce, a garden salad, smoked salmon, and mini bagels with light cream cheese.


Calories: 258kcal | Carbohydrates: 23g | Protein: 13g | Fat: 12g | Saturated Fat: 3g | Cholesterol: 172mg | Sodium: 613mg | Potassium: 467mg | Fiber: 2g | Sugar: 4g | Vitamin A: 305IU | Vitamin C: 9.6mg | Calcium: 255mg | Iron: 1.3mg

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