A gourmet twist on Potatoes Au Gratin with caramelized onions and fresh herbs. Great for brunches and potlucks.
Over low heat, add onion butter and brown sugar to a big skillet.
Cook for about 45 minutes, stirring occasionally, until the onions are caramelized.
Set the oven to 350 degrees Fahrenheit (175 degrees C).
Spray cooking oil in a 9×13-inch baking dish.
Sliced potatoes should be arranged in a single layer at the bottom of the baking dish.
Add a thin layer of onions on top.
Over the layer, drizzle some cream and sprinkle some rosemary.
Four times through the layers, finish with the onions, cream, and rosemary.
Bake for one hour, or until the top potatoes are golden brown and the sauce is bubbling, in a preheated oven.