Preheat oven to 375F and line a sheet pan with parchment paper or Silpat mat.
Whisk dry ingredients (spelt flour - cardamom) for 30 seconds in a medium bowl.
Beat butter with sugars for 2 minutes until fluffy and light.
Mix in egg completely. Mix in Sunbutter and vanilla completely. Stop machine and scrape down bowl if needed.
Add in all the flour at once. Pulse until just combined.
Fold in the oats, millet, and popped amaranth. Portion dough in 2 tablespoon mounds spaced 2 inches apart on sheet pan.
Bake for 12 minutes, turning pan halfway into baking time. Cool on the pan for 4 minutes before moving to cool completely on a wire rack (or devour them).