In a large mixing bowl, combine all-purpose flour, grated cheese, salt, garlic powder, and cayenne pepper. Mix until even.

Add cold, cubed butter to the flour mixture and work it in until it resembles coarse breadcrumbs.

Sprinkle in ice-cold water, adjusting until the dough holds together but isn't sticky.

Shape the dough into a ball, flatten into a disk, wrap in plastic, and refrigerate for at least 1 hour.

Preheat your oven to 375°F (190°C). Roll out chilled dough to 1/8 inch thick and cut into 1-inch squares.

Arrange cut crackers on parchment-lined baking sheets, brush with egg wash, and sprinkle with sea salt and herbs if desired.

Bake for 12-15 minutes until golden brown and crisp. Monitor closely to prevent overbaking.