Preparation Steps

• Preheat the oven to 375°F (190°C). Grease a 9x13 inch baking dish.
• In a medium saucepan, melt butter over medium heat. Add onions and sauté until translucent.
• Stir in the flour, salt, and pepper, and cook for 1-2 minutes.
• Gradually add milk, stirring constantly until the mixture thickens.
• Remove the saucepan from heat and stir in the grated cheddar cheese until melted.
• Layer half of the sliced potatoes in the prepared baking dish. Pour half of the cheese sauce over the potatoes.
• Repeat with the remaining potatoes and cheese sauce.
• Cover the baking dish with foil and bake in the preheated oven for 50 minutes.
• Remove foil and sprinkle paprika on top. Bake uncovered for another 10 minutes until golden brown.
• Let it cool for a few minutes before serving.