Preheat the oven at 350. Spray a 13 x 9-inch baking dish with non-stick cooking spray; set aside.
Peel and core apples, then cut each apple into 8 slices. Starting at the wide end, roll each apple slice in a crescent roll and place in the prepared baking dish. (I place 6 on each side and 4 down the middle.)
In a saucepan over medium heat, combine butter, brown sugar and cinnamon. Once thickened, remove from heat and pour evenly over the dumplings.
Pour the soda down the middle and along the edges of the baking dish (not over the rolls).
Bake the dumplings for 35-40 minutes, or until golden brown. Serve warm topped with vanilla ice cream.