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Add the flour, both cheeses, salt and cayenne to the bowl of a food processor. Pulse until combined. Scatter the cold butter chunks on top, and pulse again to form coarse crumbs.
Add egg yolk, pecans and seeds. Pulse to combine thoroughly, yielding a coarse, grainy meal.
Transfer mixture to a large stainless-steel bowl. Sprinkle the ice water on top, and knead briefly to bring the dough together, as you would a pie dough.
Divide the dough in halves or thirds, and roll each into a neat, 8-inch-long cylinder that is about the diameter of a silver dollar. Wrap each log in plastic wrap and twist the ends tightly in opposite directions, forming a perfect and compact torchon. Refrigerate until well-chilled and completely firm; overnight is ideal.
Heat the oven to 375°F. Line a large or two medium baking sheets with parchment paper or nonstick baking mats. Unwrap the dough, discarding plastic wrap, and slice the logs into thin coins, each about the width of a pencil.
Arrange the coins in neat rows on the prepared sheets. This dough won’t expand or flatten after baking, so they can be placed quite close together, but they should not touch.
Bake until golden at their centers and just starting to toast at their edges, about 20 minutes. Check them midway through baking and rotate sheets if your oven bakes unevenly.
Transfer the baking sheets to wire racks to cool. Once they are fully cooled, transfer coins to an airtight container, where they will keep for up to 3 weeks.
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