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Vegetarian Hash Brown Casserole

Vegetarian Hash Brown casserole made with sour cream, cream of mushroom soup, melted butter, and fresh sharp cheddar cheese. A decadent and crowd pleasing breakfast recipe!

Vegetarian Hash Brown Casserole Recipe

This vegetarian hash brown casserole is one of my favorite special occasion dishes. 

It’s one of our favorite breakfast casseroles, and uses frozen hash browns, just like our Hash Brown Egg Casserole recipe.

It’s complete comfort food, and every bite is absolutely delicious!

This is at the top of my husband’s favorite special breakfasts, and will most likely be a Father’s Day breakfast this year.

Vegetarian Hash Brown Casserole Recipe

How to make hash brown casserole

Be sure to thaw your hash browns in the fridge overnight before you make this dish.

Step 1: add your garlic and onion to a skillet with a drizzle of olive oil, and cook until soft. This will help avoid crunchy onions in the finished dish, while still giving the casserole a great depth of flavor!

Step 2: In a large bowl, add your hash browns, cream of mushroom soup, cooked onion and garlic, sour cream, melted butter, salt, pepper, and one cup of freshly grated sharp cheddar.

Freshly grated cheese ALWAYS tastes better, so please don’t skip this step. The flavor is worth the extra few minutes grating a block of sharp cheddar. 

Vegetarian Hash Brown Casserole Recipe

Step 3: Once mixed together, transfer the hash brown casserole to a greased baking dish.

Top with the remaining sharp cheddar cheese.

Step 4: Bake the vegetarian hash brown casserole at 375 for 40 minutes or so, until nice and browned and bubbly. 

Vegetarian Hash Brown Casserole Recipe

Kids and adults alike will love this recipe!

Perfect for a family breakfast, potluck, or any special occasion!

Vegetarian Hash Brown Casserole Recipe

More Breakfast Recipes

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Vegetarian Hash Brown Casserole Recipe

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spoon taking a scoop of hash brown casserole

Hash Brown Casserole

Joy Shull
This cheesy vegetarian hash brown casserole is always a family favorite breakfast recipe!
4.46 from 119 votes
Prep Time 10 minutes
Cook Time 25 minutes
Total Time 35 minutes
Course Breakfast Recipes
Cuisine American
Servings 10 servings
Calories 480 kcal


  • 26 oz frozen hash browns thawed overnight in the fridge
  • 1 can of cream of mushroom soup
  • 1 yellow onion finely diced
  • 6 – 8 cloves of garlic minced
  • 1 ¼ cups sour cream
  • 4 tablespoons butter melted
  • 2 cups freshly grated sharp cheddar cheese separated
  • 1 teaspoon salt
  • 1 teaspoon pepper


  • Preheat the oven to 375
  • Allow hash browns to thaw overnight in the fridge before using
  • Grease a 3 quart casserole dish and set aside
  • In a skillet, add garlic and onion with a drizzle of olive oil and cook until soft, around 10 minutes
  • In a large bowl, mix hash browns, cream of mushroom soup, onion and garlic, sour cream, butter, salt, pepper, and 1 cup of the cheese
  • Stir until well combined then transfer to casserole dish
  • Top the hash brown casserole with the remaining cheese
  • Bake at 375 minutes for 40 – 45 minutes, until browned and bubbly


Serving: 1servingCalories: 480kcalCarbohydrates: 28gProtein: 14gFat: 36gSaturated Fat: 16gPolyunsaturated Fat: 16gTrans Fat: 1gCholesterol: 74mgSodium: 798mgFiber: 3gSugar: 2g
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Recipe Rating

Gail Craig

Sunday 18th of December 2022

I have made a similar casserole for years and love it! Mine doesn’t include garlic so I’ll add it next time. I’m not a mushroom fan so I use cream of celery soup. I highly recommend adding crushed cornflakes to the top of the casserole and drizzling with melted butter before baking. It takes it over the top!

Sue Ellen

Saturday 3rd of April 2021

Can you make this ahead of time, then cook from the fridge?

Joy Shull

Saturday 3rd of April 2021

Yes, that would be fine.


Tuesday 30th of March 2021

Can a hash brown casserole be prepared at night, then baked the next morning?

Joy Shull

Saturday 3rd of April 2021

Yes, just cover it and place in the fridge until ready to bake.


Tuesday 10th of April 2018

Do you have to use condensed soup?? I am a Vegetarian and normally buy organic.

Joy Shull

Wednesday 11th of April 2018

I have not tested the recipe without cream of mushroom soup so I cannot say whether any substitutions would work.


Saturday 3rd of February 2018

was it condensed mushroom soup you used?