1Cook sausage and onion in a large skillet over medium to med-high heat, stirring until it crumbles and no longer pink. Drain and cool.
2Preheat oven to 375. Combine sausage, baking mix, and shredded cheese in a large bowl. Make a well in the center of the mixture. Stir together the soup and buttermilk; add to sausage mixture, stirring just until dry ingredients are moistened. Spoon until lightly greased mini muffin tins, filling to tops of cups. Bake for 15-18 minutes or until lightly browned.