Make sure not to pour any Mountain Dew on the dumplings themselves. Stick to the sides of the pan so you don't get the dough soggy. If liquid gets on top of the crescent dough it won't brown and will turn into a mushy mess. . . but a tasty mushy mess at least.
Use REAL Mountain Dew here! In a pinch a can of Sprite will work. Just don't choose diet soda!
Don't use a pan smaller than 9 x 13. The dumplings need just a little room to breath to be at their best!