Preparation - Drain peaches and reserve 3/4 cup of the juice. Arrange the peach slices in the bottom of a greased baking dish. In a saucepan, mix the peach juice, brown sugar, cornstarch, and cinnamon; cook until thickened. Pour half of the hot mixture over the peaches. Mix the flour, baking soda, and butter with the remaining hot mixture to form a sticky dough. Add more flour if needed. Drop by spoonfuls on top of the peaches. Add dallops of butter and sprinkle additional cinnamon over top of the dough. Bake at 350º for 30 to 40 minutes or until browned and bubbly. Serve warm. Garnish individual servings with a scoop of ice cream.