5.0 from 3,057 votes
Potatoes Au Gratin
Tender potato and onion slices are layered and baked in a rich and delicious cheese sauce.
Prep Time
20 mins
Cook Time
1 hr 20 mins
Total Time
1 hr 50 mins
Servings: 8
Calories: 268 kcal
Course:
Side Dish
Cuisine:
French , American
Ingredients
- 2 ½ pounds red potatoes
- 1 onion thinly sliced
- 3 tablespoons butter
- 3 tablespoons all-purpose flour
- 1 teaspoon dry mustard powder
- 2 cups milk
- 1 cup shredded cheddar cheese
- ½ cup shredded gruyere cheese
- ¾ teaspoon salt divided
- ½ teaspoon black pepper divided
Instructions
- Preheat oven to 400°F.
- Wash potatoes and slice into ⅛" thin slices. Slice onion as thin as possible.
- Season the potatoes and onions with ½ teaspoon of salt and ¼ teaspoon of pepper. Toss well to evenly coat. Layer potatoes and onions into little stacks. Place stacks on their side in a greased 2.5qt to 3qt casserole dish.
- Melt butter and flour in a saucepan and cook 2 to 3 minutes. Add mustard powder, ¼ teaspoon salt, ¼ teaspoon pepper and milk. Whisk over medium heat until thick and bubbly. Remove from heat and stir in cheeses until melted.
- Pour the cheese sauce over the potatoes, gently separating them to allow the sauce to seep between the layers. Cover with foil (sprayed with cooking spray) and bake 60 minutes.
- Remove foil and bake an additional 20 to 30 minutes or until lightly browned and potatoes are cooked. Cool 15 minutes before serving.
Cup of Yum
Notes
- Slice potatoes as thinly as possible.
- Shred your own cheese from a block for the best results. Fresh herbs (such as thyme or rosemary) and garlic can be added to the sauce if desired.
- To reduce baking time, wrap casserole dish in plastic wrap before adding the cheese sauce and microwave on full power for about 10 minutes (be careful, it will be hot when removing the plastic wrap). Add the cheese sauce and bake as directed for about 45-55 minutes.
- Additional cheese (cheddar or parmesan) can be sprinkled on top once the foil is removed if desired.
- Store leftovers in an airtight container for up to 4 days. Reheat in the oven or the microwave.
Nutrition Information
Calories
268
(13%)
Carbohydrates
29g
(10%)
Protein
11g
(22%)
Fat
12g
(18%)
Saturated Fat
7g
(35%)
Cholesterol
38mg
(13%)
Sodium
205mg
(9%)
Potassium
774mg
(22%)
Fiber
2g
(8%)
Sugar
5g
(10%)
Vitamin A
475IU
(10%)
Vitamin C
13.2mg
(15%)
Calcium
278mg
(28%)
Iron
1.3mg
(7%)
Nutrition Facts
Serving: 8Serving
Amount Per Serving
Calories 268
% Daily Value*
| Calories | 268 | 13% |
| Carbohydrates | 29g | 10% |
| Protein | 11g | 22% |
| Fat | 12g | 18% |
| Saturated Fat | 7g | 35% |
| Cholesterol | 38mg | 13% |
| Sodium | 205mg | 9% |
| Potassium | 774mg | 16% |
| Fiber | 2g | 8% |
| Sugar | 5g | 10% |
| Vitamin A | 475IU | 10% |
| Vitamin C | 13.2mg | 15% |
| Calcium | 278mg | 28% |
| Iron | 1.3mg | 7% |
* Percent Daily Values are based on a 2,000 calorie diet.