01 - Set the oven to 375°F and line a baking sheet with parchment paper.
02 - In a mixing bowl, whisk together flour, baking powder, salt, and cayenne pepper.
03 - Add cold diced butter and rub with fingertips until the mixture resembles coarse crumbs.
04 - Stir in finely grated cheddar cheese evenly through the mixture.
05 - Add cold water gradually, one tablespoon at a time, mixing until a stiff dough forms.
06 - Lightly flour a surface and roll dough into a 10 x 5 inch rectangle approximately 1/4 inch thick.
07 - Slice dough into thin strips about 1/2 inch wide and 5 inches long.
08 - Place strips on the baking sheet and gently twist each for a decorative effect if desired.
09 - Brush each strip with beaten egg and sprinkle with sesame or poppy seeds if using.
10 - Bake for 12 to 15 minutes until golden and crisp.
11 - Transfer to a wire rack to cool completely before serving.