In an 8" glass baking dish, melt the butter. In a separate bowl, stir together the flour, baking powder, salt, cinnamon and sugar until well combined. Add the milk and whisk until just combined. Pour the batter into the pan of melted butter and do not stir. Sprinkle the berries on top of the batter. Bake at 375ºF. for about 40 minutes or until cake is golden. Serve warm with ice cream or whipped cream.