Fry sausage and hamburger together (chopping both very finely) and drain. Add sour cream and Original Chipotle. Let mixture cool while you are cleaning and removing the stems from the mushrooms.
Add drops of butter to the bottom of a baking dish. Place mushrooms in dish and fill with hamburger/pork mixture. Add drops of butter on top of each mushroom that has been filled.
Bake at 350 for approximately 15 minutes or until tender.