Begin by preheating your oven to 425°F (220°C). This will ensure your biscuits rise beautifully and have a golden crust.

In a medium bowl, melt the salted butter in the microwave or in a small saucepan over low heat. Allow it to cool slightly, but don't let it solidify.

In a large mixing bowl, combine the Bisquick baking mix and sour cream. Stir gently until well integrated.

Slowly pour in the lemon-lime soda while continuing to mix. The carbonation will create that perfect fluffy texture.

Finally, incorporate the melted butter into the mixture, folding it gently until just combined. Be careful not to over-mix; you want to keep those air pockets for a light biscuit.

On a lightly floured surface, turn out the dough and knead it briefly, just enough to bring it together (about 5 to 6 times).

Pat the dough to a thickness of about 1 inch and use a biscuit cutter or a glass to cut out your biscuits. Place them on an ungreased baking sheet, leaving a bit of space between each one.

Bake in your preheated oven for 12-15 minutes, or until they are golden brown and flaky on top.

Once done, remove baking sheet from the oven and allow the biscuits to cool for a couple of minutes before serving.