Preheat oven to 425°F.
In a large bowl, combine flour, baking powder, sugar, and salt.
Add melted butter and 7-Up and mix until just combined.
Turn dough out onto a lightly floured surface and knead a few times.
Roll dough out to 1/2-inch thickness and cut into desired shapes.
Place biscuits on a greased baking sheet and bake for 10-12 minutes, or until golden brown.
Serve warm.