I finally used my mandoline slicer that I got for my birthday (in February)! It made this recipe really easy. I was surprised that the recipe was so simple. I saw the idea over at Fantastical Sharing of Recipes, but I adapted it for us.
3 russet potatoes, peeled and sliced into 1/4 inch slices (love using my mandoline for this!)
3 tbsp. butter, plus more for buttering baking dish
3 tbsp. all-purpose flour
2 tsp. salt
1 1/2 cups milk
1 1/2 cups cheddar cheese, shredded
Preheat oven to 400 degrees.
Butter an 8x8" baking dish and layer 1/2 potatoes into the bottom. Season with some salt and pepper.
In a medium saucepan, melt butter over medium heat. Mix in flour and salt; stir constantly with a whisk for a minute and then add milk. Cook until thickened. Stir in cheese and continue stirring until it is fully melted.
Pour half the sauce over the potatoes. Add other half of the potatoes on top, season with salt and pepper and top with remaining sauce. Sprinkle paprika over the top.
Cover and bake for 90 minutes.
Again, not an amazing photo, but the potatoes taste really good.