Step 1

Place a rack in middle of oven; preheat to 300°. Pulse brown sugar and powdered sugar in a food processor to combine. Add butter and pulse just until combined. Add einkorn flour, all-purpose flour, and salt and pulse until dough comes together. Turn out onto a clean surface; press into about a 6"-diameter disk.

Step 2

Place dough between 2 sheets of parchment paper and roll out to a ⅓"–½"-thick round. Remove top sheet of parchment and punch out cookies with larger cutter. If using smaller cutter, punch out center of each cookie. Carefully transfer cookies to a large parchment-lined baking sheet, spacing 1" apart. Reroll scraps; punch out more cookies.

Step 3

Bake cookies, rotating baking sheet front to back halfway through if browning unevenly, until golden and firm around edges, 25–35 minutes. Let cool on baking sheet.Do ahead: Cookies can be baked 2 days ahead. Store airtight at room temperature.