Potato bake with mustard and cheddar

So, I adapted this recipe to items I knew I had on hand and could replace in the printed recipe. It looks incredibly yummy! Although there is a big prep time, it takes as long to cook as a small roast, so they are finished at the same time. I use a food processor to do my thin slicing but you do it the way you are comfortable with. Preheat oven to 350 and grease a baking dish. Set aside. 2 pounds thinly sliced potatoes (5-6 cups) 1 pound thinly sliced carrots (1-2 cups) 1 large onion thinly sliced Set these aside until it is time to assemble. 2 cups of chicken broth 1 cup sour cream (they called for whipping cream) 3 tbsp of dijon mustard 3/4 tsp of italian seasoning (it called for thyme) 3/4 tsp salt (omitted) 1 tsp black pepper In a large measuring cup mix above items. 1 1/2 cups of cheddar cheese 1/4 cup flour Mix lightly and set aside. 1cup fine soft bread crumbs 1 tbsp melted butter Mix together and set aside. Ok, now you are ready to assemble! ...