How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Potatoes, Onion, Mushroom Au Gratin?

You need 12 ingredients. The key ingredients include: 5 lb. potatoes, 1/2 c. butter, 1 lb. mushrooms, 1/2 c. flour, and more.

Is Potatoes, Onion, Mushroom Au Gratin suitable as soups & stews?

Yes, Potatoes, Onion, Mushroom Au Gratin falls under the Soups & Stews category and is a great choice for this type of meal.

How do I store leftover Potatoes, Onion, Mushroom Au Gratin?

Store leftovers in an airtight container in the refrigerator for up to 3–4 days. Reheat gently before serving.

Potatoes, Onion, Mushroom Au Gratin Recipe

Name: Potatoes, Onion, Mushroom Au Gratin
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 5 lb. potatoes; 1/2 c. butter; 1 lb. mushrooms; 1/2 c. flour; 1 qt. milk; 1 c. cream or evaporated milk; 1 can condensed consomme; 1 lb. sharp cheese, grated; 1 Tbsp. seasoned salt; 1/4 tsp. pepper; 1 tsp. Worcestershire sauce; 2 cans small white onions

Try this homemade Potatoes, Onion, Mushroom Au Gratin recipe the whole family will love. Made with potatoes, butter, mushrooms and flour. Easy step-by-s…

This Potatoes, Onion, Mushroom Au Gratin relies on simple, everyday ingredients such as potatoes, butter, mushrooms and flour. It comes together quickly and makes 4 servings, at about 1545 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It works as a light main on its own or as a starter alongside crusty bread, and it's just as good for a cozy night in as it is for feeding a crowd. Leftovers keep well, so it's a smart choice for meal prep too.

Updated Jun 30, 2026

Serves 4 Soups & Stews

1545

kcal

Calories

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Taste as you go and adjust the seasoning before serving.
Avoid overcrowding the pan — cook in batches if needed for the best texture.
Let the dish rest for a few minutes before serving so the flavors settle.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.
A good 1:1 gluten-free flour blend works well if you need a gluten-free version.
Coconut cream is a reliable plant-based alternative to dairy cream.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Potatoes, Onion, Mushroom Au Gratin

Tips for the best results

Variations & substitutions

My Personal Notes

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Frequently Asked Questions