Ingredients
Equipment
Method
Step-by-Step Instructions
- Preheat your oven to 375°F (190°C) and grease a 9x13-inch baking dish with butter or cooking spray.
- Slice the potatoes thinly to about 1/8 inch using a mandoline or sharp knife.
- Layer the potato slices in the greased baking dish, forming a tight single layer.
- Melt 4 tablespoons of unsalted butter in a medium saucepan over medium heat.
- Add minced garlic and sauté for about 30 seconds until fragrant.
- Whisk in ¼ cup of all-purpose flour, stirring continuously for about 1 minute to form a roux.
- Gradually whisk in 1 cup of heavy cream and 1 cup of whole milk, and simmer on medium-low for 3-5 minutes until it thickens.
- Layer more potato slices and sprinkle a generous amount of shredded cheese, repeating until all potatoes and cheese are used.
- Pour the warm sauce evenly over the layered potatoes and cheese.
- Cover the dish tightly with aluminum foil and bake for 45 to 60 minutes until the potatoes are fork-tender.
- After baking, remove the foil and bake for an additional 20 to 30 minutes until golden brown and bubbly.
- Let the dish rest for 10 to 15 minutes before serving.
- Garnish with sliced green onions before serving.
Nutrition
Notes
For a gluten-free version, substitute all-purpose flour with gluten-free flour.
