Potato and Sausage Gratin
Preheat oven to 375º
Melt the butter in a large saucepan over medium high heat. Add the onion and sauté 3-4 minutes, until translucent. Add the flour and cook, stirring, 2 minutes more. Add the milk and stir to combine. Bring to a boil, then reduce heat to a simmer and continue to cook 3-5 minutes, until the sauce begins to thicken. Heavily season with salt and pepper.
In a buttered baking dish, layer the potatoes, sausage and milk mixture. Top with the toasted breadcrumbs and bake for 30-45 minutes until the top is browned and bubbly. Allow to cool 10 minutes before serving.