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Au Gratin Scalloped Potatoes Onions Recipe

Transform leftover potatoes and sweet onions into a creamy, cheesy, and utterly irresistible Au Gratin Scalloped Potatoes and Onions! This comforting casserole is surprisingly easy to make, boasting layers of thinly sliced potatoes and sweet onion rings, all bathed in a rich, homemade cheese sauce. A perfect side dish or a satisfying vegetarian main course, this recipe is sure to become a family favorite.

Prep Time 25 mins
Cook Time 95 mins
Calories 439.7 kcal
Protein 30g
Rating 5.0 (1 Reviews)
Au Gratin Scalloped Potatoes Onions 83

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Recipe Author

Chef Forktionary, author of this recipe

Recipe adapted from Food.com. Standardized by Forktionary.

Ingredients for Au Gratin Scalloped Potatoes Onions

  • 3 tablespoons butter
  • 1 tablespoon all-purpose flour
  • 2 cups milk
  • 1/4 teaspoon cracked black pepper
  • 1/2 teaspoon dried oregano
  • 1/2 teaspoon dried basil
  • 1 clove minced garlic
  • 3 medium potatoes (about 2 pounds)
  • 2 medium sweet onions
  • 2 cups shredded cheddar cheese
  • 1/2 cup Italian breadcrumbs

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How to Make Au Gratin Scalloped Potatoes Onions

  1. Preheat oven to 350°F (175°C). Grease a 9x13 inch baking dish.
  2. Melt 2 tablespoons of butter in a small saucepan over medium heat.
  3. Whisk in 1 tablespoon of all-purpose flour until smooth.
  4. Gradually whisk in 2 cups of milk, stirring constantly until the sauce thickens.
  5. Stir in 1/4 teaspoon of cracked black pepper, 1/2 teaspoon of dried oregano, 1/2 teaspoon of dried basil, and 1 clove of minced garlic. Set aside.
  6. Thinly slice 3 medium potatoes (about 2 pounds) and 2 medium sweet onions. Separate the onion rings.
  7. Layer 1/3 of the potato slices, 1/2 of the onion rings, and 1 cup of shredded cheddar cheese in the prepared baking dish.
  8. Repeat layers once more: 1/3 of the potatoes, 1/2 of the onions, 1 cup of cheese.
  9. Top with the remaining 1/3 of the potato slices.
  10. Pour the cream sauce evenly over the potatoes.
  11. Sprinkle 1/2 cup of bread crumbs evenly over the top.
  12. Dot with 1 tablespoon of melted butter.
  13. Cover the baking dish with foil and bake for 1 hour.
  14. Remove foil and bake for an additional 15 minutes, or until the potatoes are tender and the topping is golden brown.

Nutrition Information (Approximate per serving)

Sodium

14 g

Sugar

10g

Fat

83g

Carbs

12g

Recipe Categories (Choose a category and find related recipes!)

Main Courses Main Dish / Dinner Sweets & Sides Side Dishes The Americas American Vegetarian Fall Recipes Holiday Recipes

Recipe Tags (Choose a tag and find related recipes!)

Weeknight Time To Make Course Main Ingredient Preparation Casseroles Side Dishes Potatoes Vegetables Oven Dietary Low Sodium Low In Something Onions Equipment 4 Hours Or Less