This is something my mom always made for holidays by baking it in the oven. However, I discovered it cooks just as well in a slow cooker. It's easy to put together and makes a fairly large amount.
1 can French onion soup
1 can beef broth
1 cup rice
1 package slivered or sliced almonds
1/2 stick butter
Combine all ingredients in a crock pot. Cook on high until liquid is mostly absorbed (about 3 hours), and then turn to low until liquid is completely absorbed (about 1 hour).