Craving some rustic vegetable goodness? This potato, carrot, and mushroom gratin is here for you. The soft flavors of the vegetables combine perfectly with the creamy dairy topping. The wonderful thing is you can... add or change your vegetable base depending on preference. With only one pan in use, the clean up is quick and easy.
In a greased casserole dish, arrange the sliced potatoes, carrots, and mushrooms overlapping. Season the vegetables with salt and pepper.
In a small sauce pot over medium low heat, melt the butter. Once melted, add the flour and a pinch of salt. Stir constantly for 1 minute. Add the milk and continue to stir occasionally until it begins to thicken. Once milk mixture has thickened, remove from the heat, mix in the cheese and allow to melt.
Pour the cheese sauce over the potatoes, carrots, and mushrooms. Cover the dish with a sheet of aluminum foil and place in oven. Bake until the gratin until the vegetables are tender and sauce is bubbling, about 40-60 minutes.