Heat oven to 350. Spray an 8" x8" baking dish w/ ccooking spray. Peel the apple and cut into 8-10 wedges.
separate crescent rolls into triangles. Place an apple wedge at wide part of each triangle. Roll up and pinch to seal. Place triangles in baking dish.
In saucepan, melt butter over medium heat. Stir in sugar and cinnamon, whisk to combine until thickened. Whisk in vanilla. Pour mix over dumplings. Pour soda oveer dumplings. Bake 40 mins or until golden brown.