Roast cut per your taste/preference
1 packet of dry onion soup mix
Splash of worcestershire sauce
1/2 to 1 cup of water, depending on size of roast
Place roast in your crockpot, add a splash of worcestershire sauce. Pour the packet of dry onion soup mix over roast. Pour water over roast
Layer the potatoes and carrots around the roast.
Cook in crockpot 10-12 hours low, 6-8 hours high.
Or do the same as above but preheat the oven to 350 F, arrange pot roast and such in a baking dish and bake for about 2 hours. Use a meat thermometer to check that the roast is to temperature. Sometimes I cover the baking dish with aluminum foil for the first hour and a half and then remove for the last half hour, just depends on if I have the time to mess with it.