Preheat oven to 350°F. Grease and flour 12 muffin cups. Empty contents of package into a mixing bowl. Add sugar, cinnamon, nutmeg, salt, butter, eggs and sour cream. Stir until incorporated. Gently add blueberries. Divide evenly in prepared muffin cups. Bake for 20 to 25 minutes or until golden. Test with a toothpick. Serve warm with butter. Makes 12 muffins.
