Line a baking sheet with parchment paper and preheat oven to 300℉.
Using a mixer, beat butter until light and fluffy. Combine dry ingredients together, and gradually add to creamed butter until well blended.
1 ½ cup butter, 2 ¼ cup flour, ¾ cup sugar, ¾ cup cornstarch
If dough is sticky, dust hands with additional cornstarch as you shape dough into 1″ balls. Flatten slightly with the palms of your hands. Dip in nonpareils and place on a parchment lined baking pan about 2″ apart.
blue nonpareils
Bake for 20-22 minutes until set but not brown.
Remove from oven and transfer to a wire rack to cool completely.