Preheat oven to 400°.

Mix flour, baking powder and salt together and then cut in the shortening until mixture resembles fine crumbs. Mix this with sour cream and then stir in the lemon-lime soda. Only stir until just barely combined - you don't want to overmix!

Pat lightly onto a floured surface. The dough should be about 1" thick, but you can make the biscuits a little bit thinner if you want to make more of them. You should be able to make about 9-12 biscuits, depending on how thick you make them. This is a wet dough so make sure to flour the surface well. Cut out biscuits and place 2 inches apart on ungreased cookie sheet. I like to use these biscuit cutters, but you can use the rim of a glass or the lid to a jar - just make sure to grease them before cutting the biscuits.

Bake for 10-12 minutes, until light golden brown. Brush with melted butter right as they come out of the oven! Best served warm, but can easily be reheated later.