Preheat oven to 350°F. Lightly spray a 6-count muffin pan with nonstick cooking spray. Mix melted butter and brown sugar together and divide equally among muffin cups.

In a small bowl, combine granulated sugar and cinnamon. In a separate bowl, mix House-Autry Buttermilk Biscuit Mix with buttermilk; stir until just blended. Roll dough into approximately 30 small balls using a heaping teaspoonful or small cookie scoop as a measure. Dip balls into cinnamon sugar mixture and divide equally among muffin cups. Bake for 12-15 minutes. Allow to cool for 15 minutes before removing from pan. Run a knife around the outer edges; turn upside down and serve.