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 Caramelized Onion Mashed Potato Bake?

You need 10 ingredients. The key ingredients include: 4 pounds baking potatoes, 2 teaspoons salt, 1 1/4 cups warm buttermilk, 1/2 cup warm milk, and more.

Is Caramelized Onion Mashed Potato Bake suitable as general?

Yes, Caramelized Onion Mashed Potato Bake falls under the General category and is a great choice for this type of meal.

How do I store leftover Caramelized Onion Mashed Potato Bake?

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

Caramelized Onion Mashed Potato Bake Recipe

Name: Caramelized Onion Mashed Potato Bake
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 4 pounds baking potatoes; 2 teaspoons salt; 1 1/4 cups warm buttermilk; 1/2 cup warm milk; 1/4 cup melted butter; 1/2 teaspoon pepper; 1 teaspoon salt; 1 1/4 cups freshly grated Gruyere cheese; 1 cup chopped caramelized onion; 2 tablespoons chopped fresh parsley

Try this homemade Caramelized Onion Mashed Potato Bake recipe the whole family will love. Made with baking potatoes, salt, warm buttermilk and warm milk…

This Caramelized Onion Mashed Potato Bake relies on simple, everyday ingredients such as baking potatoes, salt, warm buttermilk and warm milk. It comes together quickly and makes 4 servings, at about 1147 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

It's versatile enough for an easy weeknight dinner yet satisfying enough for guests at the weekend. Serve it with your favorite sides, and keep any leftovers for a quick meal the next day.

Updated Jun 30, 2026

Serves 4 General

1147

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.

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

My Personal Notes

Saved locally in your browser — visible only to you.

Caramelized Onion Mashed Potato Bake

Tips for the best results

Variations & substitutions

My Personal Notes

How did you like this recipe?

Frequently Asked Questions