1Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large bowl, whisk together the all-purpose flour, baking powder, and salt.
Cut the unsalted butter into small cubes and add it to the flour mixture. Use a pastry cutter or your fingers to work the butter into the flour until the mixture resembles coarse crumbs.
Stir in the shredded cheddar cheese and diced jalapeños until evenly distributed.
Make a well in the center of the mixture and pour in the buttermilk. Stir until the dough just comes together. Be careful not to overmix.
Turn the dough out onto a lightly floured surface and gently knead it a few times to bring it together.
Pat the dough into a circle about 1 inch thick. Cut the dough into 8 wedges and place them on the prepared baking sheet.
Bake in the preheated oven for 18-20 minutes, or until the scones are golden brown.
Remove from the oven and let cool slightly on a wire rack before serving.