In a large bowl, cream the butter with a wooden spoon or silicone spatula until whipped, light, and fluffy, 1-2 minutes.
Add the salt and stir to incorporate. Add the powdered sugar; mix until combined.
Sift together the flours and dried chamomile. Remove any large pieces of stem that make it through the sifter, if necessary.
Add flour mix to butter mixture; stir just until combined.
Roll dough out between two sheets of parchment paper to about 1/4" inch thickness. Do NOT add flour - it will make the final texture of your cookies tough.
Chill dough until firm, about 20 minutes.
Cut out desired shapes. You can use a cookie cutter, biscuit cutter, or a fluted pastry wheel, like I did here. Re-roll any leftover dough scraps to cut more cookies as needed, but try to minimize re-rolling and shaping dough, as it will get tougher the more you work it.
Chill cut cookies again until firm, at least 10 minutes. Preheat oven to 325° F while chilling.
Bake until cookies are firm but not yet browning, about 12-15 minutes.
Allow cookies to cool for about 10 minutes before applying chamomile sugar.