Easy way to make a round roast in a crock pot with carrots and potatoe?

I want to make a round roast with carrots and potatoes but i want to do it in my slow cookerr. I have no recipe and wonder if anyone on here had a good idea. Not fancy just some good old fashion meat veg and potatoe. Basically like grandmas cooking but only not in the oven..or even if i could get close..I have never cooked one before. Any help at all is appreciated.