Crock Pot Spaghetti Sauce recipe.. please?

[KaterBell]

Does anyone have a tried and true spaghetti sauce recipe for the crockpot? I'd love to have a nice, flavorful tomato sauce, that I can add some green and red peppers to for extra flavor....

How about a Puttenesca sauce? (capers and olives.)... ? Yum yum!

Thanks!