01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large mixing bowl, whisk together the flour, baking powder, sugar, salt, and garlic powder until uniformly blended.
03 - Add the cold, cubed unsalted butter to the dry mixture and use a pastry cutter or fingertips to work it in until the mixture resembles coarse crumbs.
04 - Stir in shredded cheddar, chopped cranberries, finely diced jalapeño, and optional chives until evenly distributed.
05 - In a separate bowl, whisk together the buttermilk and egg, then pour into the flour mixture and stir gently just until a soft dough forms. Avoid overmixing.
06 - Turn the dough onto a lightly floured surface and pat into a rectangle approximately 1 inch thick. Use a 2.5-inch round biscuit cutter to cut out biscuits, gathering and reshaping scraps as needed.
07 - Place biscuits onto the prepared baking sheet and transfer to the oven. Bake for 16 to 18 minutes, until golden brown and cooked through.
08 - Cool slightly on a wire rack and serve warm. Optionally, accompany with cranberry jalapeño dip or whipped butter.