This is a wonderful summer dish to make to use your fresh tomatoes and zucchini from your garden. I have made this dish in the winter and used canned tomatoes and it was just as good.
- Combine all ingredients, except butter and cheese, in a slow cooker.
- Set temperature on low and heat for 3 hours.
- dot casserole with butter and sprinkle with cheese.
- Cook 1 1/2 hours more on low setting.