Step 1: Preheat the Oven & Prepare the Dish

• Preheat your oven to 375°F (190°C).
• Grease a 9×13-inch baking dish with butter or cooking spray.

Step 2: Slice the Potatoes

• Wash, peel (if desired), and thinly slice the potatoes about ⅛-inch thick.
• Use a mandoline slicer for even slices, or a sharp knife.

(💡 Pro Tip: If not using immediately, soak the potatoes in cold water to prevent browning. Drain and pat dry before layering.)

Step 3: Make the Creamy Sauce

• In a saucepan over medium heat, melt the butter.
• Add the diced onion and garlic, and cook until soft and fragrant (about 2-3 minutes).
• Sprinkle in the flour, stirring constantly for 1-2 minutes to cook out the raw flour taste.
• Gradually whisk in milk and heavy cream, stirring until the mixture thickens slightly (about 3-4 minutes).
• Stir in salt, pepper, and paprika.

(💡 For Extra Flavor: Add ½ teaspoon Dijon mustard for a tangy twist!)

Step 4: Layer the Potatoes & Sauce

• Arrange half of the sliced potatoes in the prepared baking dish.
• Pour half of the creamy sauce over the potatoes.
• (Optional) Sprinkle ½ cup cheddar cheese over the layer.
• Repeat with the remaining potatoes, sauce, and cheese.

Step 5: Bake Until Golden & Bubbly

• Cover with foil and bake for 40 minutes.
• Remove the foil, sprinkle Parmesan cheese on top, and bake uncovered for 20-25 more minutes until golden brown and bubbling.
• Let it cool for 10 minutes before serving.

Step 6: Garnish & Serve!

• Sprinkle with fresh thyme or parsley for an extra pop of flavor.
• Serve warm and enjoy every rich, creamy, cheesy bite!