Yield 12 biscuits
Preheat the oven to 425ºF. In a medium bowl combine the bread flour, all-purpose flour, sugar, baking powder, baking soda, and salt. With a pastry blender, fork, or two knives, cut the butter into the flour until the mixture is the consistency of coarse cornmeal; set aside.
In a small bowl, combine the cheese, milk, 1 egg, and jalapeño. Add this cheese mixture to the flour mixture and stir just until the dough starts to pull away from the sides of the bowl. Do not overmix.
Scrape the dough from the bowl onto a lightly floured surface and knead lightly 8 to 12 times, gently pressing the dough together as you knead. Roll out or use your fingertips to press down the dough to a 1-inch thickness; using a 2-inch round cutter, cut the dough into biscuits. Gather scraps together, re-roll, and cut additional biscuits.
Place the biscuits on an un-greased baking sheet approximately 1 inch apart and lightly brush the tops with the egg wash. Bake until golden brown, 12 to 15 minutes.
Recipe by Darra Goldstein at https://darragoldstein.com/cheddar-jalapeno-biscuits/