If I know I’ll be baking, I pull my butter out of the fridge the night before to get to room temp. But if you’re baking spontaneously, no worries, just zap your butter in the microwave on half-power for about 12 seconds.
Preheat oven to 350 degrees F.
I use parchment paper sheets on my cookie sheets and reuse them for all my batches that day.
In your mixer bowl (or large bowl with hand-mixer) cream butter and both sugars until light and smooth, about 2-3 minutes.
Beat in the egg, vanilla extract and cinnamon spice emulsion, until smooth.
In a separate small bowl, combine flour, baking soda, salt and cocoa. Add to wet ingredient mixing bowl a little at a time.
Mix until thoroughly blended.
Form dough into balls about 1.5" in size and place a few inches apart on parchment lined cookie sheet.
Roll balls in cinnamon sugar.
Bake at 350 for 10 minutes. They will be puffy, and edges will be set.
Cool cookies on cookie sheet for a few minutes before transferring to cooking rack to cool completely.