I have found one from Rival in there Help Section. You can print out that page as it will give you everything that is in the little booklet you get with the product minus the few receipies they gave you. All the cooking and baking times are there plus a few things about care and cleaning.
The URL is below.. and go down about a 1/4 of the page and see Roaster Ovens
Kenmore Sewing Machine 148.231 Please help find the manual for this Kenmore Sewing Machine Made in 66 or 67. given to me by a friend and I need a manual and some replacement parts