Creamy Rosemary Au Gratin Potatoes Recipe

Preheat oven to 400 degrees F (205 degrees C). Grease a 1-quart baking dish with about 1 teaspoon butter.

Melt remaining butter in a saucepan over medium heat. Add flour and 1/2 teaspoon sea salt; whisk constantly for 1 minute. Pour half-and-half into flour mixture stirring and cooking until mixture has thickened about 4 minutes.

Layer half the potatoes into the bottom of prepared baking dish. Top with onion slices rosemary 1/2 cup Cheddar cheese and remaining potatoes; season with sea salt and pepper. Sprinkle 1 cup Cheddar cheese and paprika over potatoes. Pour half-and-half mixture over potato mixture; cover with aluminum foil.

Bake in preheated oven until potatoes are tender about 75 minutes. Remove aluminum foil and continue baking until potatoes are lightly browned about 15 minutes.