Au Gratin Potatoes with Onions are deliciously creamy and cheesy. The added flavor of the onion baked inside is amazing! This dish is homemade from scratch.

This recipe serves two people cooked in individual dishes for a romantic dinner, but could also be cooked in one dish if preferred. Plan ahead as it takes 1 ½ hours to bake, but is so worth it!

Need a main dish? Try this Tilapia Parm or these Individual Meatloaves.

Potato Gratin for Two in a casserole dish. — Potato Gratin for Two

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How to make Au Gratin Potatoes with Onions

Preheat the oven to 400 degrees F (200 C).

Spray two 20-ounce oven-safe baking dishes with non-stick cooking spray.

For the Potatoes and Onions

Slice the potatoes into 1/4-inch slices and slice the onions into rings. I love the food processor for slicing. Click for a food processor.

sliced potatoes, a knife, and sliced onions on a cutting board.

Layer half of the onions into the bottom of the prepared dishes, divided evenly

two bowls with sliced onions in the bottom.

Add the potato slices, and divide evenly between the dishes.

two bowls with sliced potatoes sprinkled with black pepper.

Sprinkle the potatoes with salt and pepper to taste.

Top with the other half of the onions, divided evenly.

two bowls filled with sliced potatoes topped with sliced onions.

For the Au Gratin Cheese Sauce

In a medium-sized saucepan, melt butter over medium heat.

Mix in the flour and salt, and stir constantly with a whisk for one minute.

butter and flour cooking in a sauce pan.

Stir in milk. Cook until the mixture has thickened.

a white sauce and red spatula in a sauce pan.

Add in the cheese all at once, and continue stirring until melted, about 30 to 60 seconds.

a creamy au gratin cheese sauce and red spatula in a sauce pan.

Pour the cheese sauce over the potatoes, and divide evenly. Sprinkle with more salt and pepper if desired.

two bowls filled with French Potatoes Au Gratin. — French Potatoes Au Gratin

Cover the dishes with aluminum foil.

two bowls covered with foil on a baking sheet.

Place the two dishes on a baking sheet.

Bake for 1 1/2 hours in the preheated oven.

Broil for 2 – 5 minutes to brown the top, if desired.

Au Gratin Potatoes for Two in a casserole dish. — Au Gratin Potatoes for Two

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Au Gratin Potatoes with Onions

Zona House

Au Gratin Potatoes with Onions are deliciously creamy and cheesy. The added flavor of the onion baked inside is amazing! This dish is homemade from scratch. Plan ahead as it takes 1 ½ hours to bake, but is so worth it!

4.46 from 24 votes

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Prep Time 15

Cook Time 1 30

Total Time 1 45

Course Side Dishes

Cuisine American

Servings

Calories 311 kcal

Equipment

Ingredients

For the Potatoes:

▢ 2 medium russet potatoes
▢ 1 small onion
▢ Salt and pepper to taste

Instructions

Preheat the oven to 400 degrees F.
Spray two 20 ounce oven safe baking dishes (or an 8×8-inch square baking dish) with non-stick cooking spray.

For the Potatoes:

Slice the potatoes into 1/4 inch slices and slice the onion into rings. A food processor works great for this. Click for a food processor.
Layer half of the onions into the bottom of the prepared dishes, divided evenly.
Add the potato slices, divided evenly between the dishes.
Sprinkle the potatoes with salt and pepper to taste.
Top with the other half of the onions, divided evenly.

For the Sauce:

In a medium-size saucepan, melt butter over medium heat.
Mix in the flour and salt, and stir constantly with a whisk for one minute.
Stir in milk. Cook until mixture has thickened.
Add in the cheese all at once, and continue stirring until melted, about 30 to 60 seconds.
Pour the cheese sauce over the potatoes, divided evenly. Sprinkle with more salt and pepper if desired.
Cover the dishes with aluminum foil.
Place the two dishes on a baking sheet.
Bake 1 1/2 hours in the preheated oven.
Broil for 2 – 5 minutes to brown the top, if desired.

Video

Nutrition

Serving: 1Calories: 311kcalCarbohydrates: 28gProtein: 12gFat: 17gSaturated Fat: 10gPolyunsaturated Fat: 1gMonounsaturated Fat: 4gTrans Fat: 0.2gCholesterol: 51mgSodium: 405mgPotassium: 603mgFiber: 2gSugar: 5gVitamin A: 558IUVitamin C: 8mgCalcium: 297mgIron: 1mg

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Hi and welcome. I’m Zona and I have a passion for recipes. I share recipes, tips, tricks, and resources to help you cook for two. Eat, drink, and enjoy!