Preheat your oven to 400°F (200°C).

In a large mixing bowl, combine all-purpose flour and salt.

Add cubed cold unsalted butter into the flour mixture and work until the mixture resembles coarse crumbs.

Stir in the grated cheddar or pepper jack cheese along with the minced fresh jalapeños.

Beat the egg until smooth, then pour it into the dry mixture and stir until just combined.

Turn the dough onto a lightly floured surface, knead gently, and roll out to about ½ inch thick.

Arrange the cut biscuits on a baking sheet and bake for 15-18 minutes until golden brown.

Remove from the oven and let them cool on the baking sheet for a few minutes before serving.