Preheat oven to 425ºF (220ºC) and prepare parchment-lined baking sheet.
In a large mixing bowl whisk together flour, baking powder, salt and pepper. Grate butter into the dry ingredients, add grated cheddar and chopped jalapeños and toss with your hands until evenly distributed.
Pour in buttermilk and continue to stir until the buttermilk has been absorbed and you can’t see any more flour bits. The dough will seem dry, and that’s okay!
Drop by ¼ cupful’s onto prepared baking sheet, spacing them apart so you get 4 rows of 3 biscuits each. If the dough sticks in the measuring cup, use a butter knife to work around the edges and pull the dough out onto the baking sheet.
Bake until the tops are golden, about 15 minutes. Transfer to a wire cooling rack and let cool for 5 minutes. Serve warm.