Cut apples into 8 slices each. Roll each slice into a crescent roll. Place in a 9x13 lightly buttered pan. Melt butter, then add sugar, and barely stir. Add vanilla, stir, and pour over apples. Then pour the Mountain Dew around the edges of the pan. Sprinkle with cinnamon and bake at 350 degrees F for 40 minutes. 2 granny smith apples, 2 cans crescent rolls dough, 1C. butter, 1C. sugar, 1 tsp. vanilla, cinnamon, 1 can Mountain Dew