This is literally the easiest thing to do. Pour the dry mix into a bowl and smash any lumps with a fork. Open the can of soda and pour in, mix with a spoon until just mixed. Pour into greased pan or cupcake papers and bake as directed on the box. You wouldn't think this would work, but it does. They are a bit more crumbly than normal but very moist! Play with the combinations- my favorites are orange soda in a lemon cake or black cherry in a chocolate one... Cool completely and ice with your favorite icing or sprinkle with fresh fruit and powdered sugar.