Recipes Breakfast and Brunch Potatoes Christmas Brunch Casserole 4.4 (489) 372 Reviews 30 Photos This Christmas breakfast casserole with hash browns, mushrooms, bacon, and eggs is easy to prepare on Christmas Eve. Just pop it in the oven for an hour on Christmas morning, and enjoy it for breakfast or brunch. Submitted by pamjlee Updated on November 7, 2023 Tested by Allrecipes Test Kitchen Tested by Allrecipes Test Kitchen The Allrecipes Test Kitchen staff are a team of culinary pros who make and vet recipes using only equipment you'd find in a home kitchen. Staff credentials vary but include training at the Culinary Institute of America; kitchen stints in fine dining restaurants; and countless hours in the test kitchen itself. Meet the Allrecipes Test Kitchen Save Rate Print Share Add Photo 30 30 30 30 Prep Time: 20 mins Cook Time: 1 hr 15 mins Additional Time: 8 hrs Total Time: 9 hrs 35 mins Servings: 8 Yield: 1 9x13-inch casserole Jump to Nutrition Facts Cook Mode (Keep screen awake) Ingredients 1x 2x 4x Oops! Something went wrong. Our team is working on it. Original recipe (1X) yields 8 servings 1 pound bacon 2 medium onions, chopped 2 cups fresh sliced mushrooms 1 tablespoon butter 4 cups frozen hash brown potatoes, thawed 1 teaspoon salt ½ teaspoon ground black pepper ¼ teaspoon garlic salt 4 medium eggs 1 ½ cups milk 1 pinch dried parsley 1 cup shredded Cheddar cheese Directions Gather all ingredients. Allrecipes/Karen Hibbard Cook bacon in a large skillet over medium-high heat, turning occasionally, until evenly browned, about 10 minutes. Transfer bacon to a paper towel-lined plate and crumble when cool enough to handle. Drain grease from the skillet. Allrecipes/Karen Hibbard Cook onions and mushrooms in the residual grease in the skillet until onions are translucent and mushrooms are tender, about 5 minutes. Allrecipes/Karen Hibbard Grease a 9x13-inch casserole dish with 1 tablespoon of butter. Place potatoes into the bottom of the dish; sprinkle with salt, pepper, and garlic salt. Top with crumbled bacon, then add onions and mushrooms. Allrecipes/Karen Hibbard Whisk milk, eggs, and parsley together in a mixing bowl; pour over casserole and top with Cheddar. Cover and refrigerate, 8 hours to overnight. Allrecipes/Karen Hibbard Allrecipes/Karen Hibbard When ready to bake, preheat the oven to 400 degrees F (200 degrees C). Bake in the preheated oven until set, about 1 hour. Allrecipes/Karen Hibbard Serve hot and enjoy! Allrecipes/Karen Hibbard Recipe Tip If you're baking this the same day you make it and it won't be refrigerated, reduce cook time to 45 minutes. I Made It Print 782 home cooks made it! Nutrition Facts (per serving) 421 Calories 33g Fat 17g Carbs 14g Protein Show Full Nutrition Label Hide Full Nutrition Label Nutrition Facts Servings Per Recipe 8 Calories 421 % Daily Value * Total Fat 33g 42% Saturated Fat 13g 66% Cholesterol 61mg 20% Sodium 908mg 39% Total Carbohydrate 17g 6% Dietary Fiber 1g 5% Protein 14g 28% Vitamin C 7mg 8% Calcium 170mg 13% Iron 1mg 8% Potassium 486mg 10% * Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs. ** Nutrient information is not available for all ingredients. Amount is based on available nutrient data. (-) Information is not currently available for this nutrient. If you are following a medically restrictive diet, please consult your doctor or registered dietitian before preparing this recipe for personal consumption.