Preheat oven to 400 degrees. Wash blueberries and drain peaches. Spread fruit on paper towels. In a small bowl, combine sugar, flour, cinnamon. Cut in butter and set aside. Mix muffin batter as directed on label EXCEPT do not fold in blueberries. Spread batter in a greased 20 cm square pan. Top with drained blueberries and peaches. Sprinkle cinnamon mixture over the fruit and bake at 200ºC or 25 minutes. Randy Rigg