1/2 cup sour cream
1/2 to 1 cup 7-Up (or any lemon lime soda)
1/4 cup melted butter
Preheat to 450
Cut the sour cream into the biscuit mix; using a knife, fork, pastry cutter, or even your fingers, just work it in as well as you can.
Stir in 1/2 cup 7-Up. If dough isn't very soft, add a bit more.
Sprinkle some additional baking mix onto your counter. About a half cup should do.
Scrape dough out of bowl onto the flour. Knead and fold dough until coated with the baking mix and just until it's a dough-like consistency.
Pat dough out, and use a biscuit cutter or glass, or empty soup can to cut out about 9 or 10 fat biscuits. Wet the rim of cutter with water, sprinkle with flour, then press into dough to cut.
The tricky part here is to make biscuits fit into the pan right, so keep the pan size in mind.
Melt the butter in a 9 inch square pan. Add the biscuits to pan on top of melted butter, and bake 12-15 mins or until brown.
You may want to broil at the end to make tops browner. but watch very closely.
