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