Source: All Recipes

Rich and creamy potatoes au gratin, aka the ultimate comfort food, is made with sliced potatoes, cheese, and milk. The creamy cheese sauce and the tender potatoes in this classic French dish combine to make a deliciously addictive experience. It’s the perfect side dish for the holidays or for dinner any day.

By CathyM

Ingredients

• 4 russet potatoes, sliced into 1/4 inch slices
• 1 onion, sliced into rings
• salt and pepper to taste
• 3 tablespoons butter
• 3 tablespoons all-purpose flour
• ½ teaspoon salt
• 2 cups milk
• 1 ½ cups shredded Cheddar cheese

Directions

• Step 1

  Preheat oven to 400 degrees F (200 degrees C). Butter a medium casserole dish.

• Step 2

  Layer 1/2 of the potatoes into bottom of the prepared casserole dish. Top with the onion slices, and add the remaining potatoes. Season with salt and pepper to taste.

• Step 3

  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. Stir in cheese all at once, and continue stirring until melted, about 30 to 60 seconds. Pour cheese over the potatoes, and cover the dish with aluminum foil.