Preheat oven to 350 degrees.
In large pot over medium heat, melt butter and sauté onion. Once tender add remaining ingredients and stir to combine, heating through to melt the cheese.
Pour into greased casserole dish, cover and bake for 1/2 hour. Uncover and bake an additional 1/2 hour. Can also be put in a slow cooker instead.
Originally Submitted
2/10/2016
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