Preheat oven to 350.
Butter a 13x9 inch baking dish.
Peel and core apples. Cut each into 8 wedges
Roll each apple piece in a crescent roll and place in prepared dish.
Melt butter in a saucepan and add sugar, vanilla and cinnamon.
cook on low until thickened.
Pour over dumplings.
Carefully, pour the soda into the middle and sides of a pan, avoiding pouring onto rolls.
Bake for 45 minutes, or until golden brown.