In a large bowl, mix together flour, baking powder, sugar, and garlic salt. Add the cheese and jalapenos and mix to combine. Add the butter milk and mix gently until it just comes together as dough.
Pour melted butter into an 8x8" baking dish. Place dough into dish and spread out evenly. Use a sharp knife to cut dough into 9 even pieces.
Place the baking dish on a large baking sheet, and bake in a preheated oven at 450℉ for about 25 minutes, until biscuits are golden and browning.
Remove from oven and allow to cool for 15 minutes before slicing.
Notes
Calories are automatically generated. For best results calculate based on your exact ingredients.