Mix all the dry ingredients except for the granulated and brown sugar (all-purpose flour, cake flour, cornstarch, sprinkle jimmies, baking soda & salt) in a bowl and set aside.
Add the egg to the butter/sugar mixture and mix again until evenly combined.
1 large egg
Add in all the dry ingredients from step 2 and combine until there are no dry spots or lumps of flour.
You can bake these cookies right away or chill the dough for at least 10-15 minutes if you want them to be thicker. The longer you chill the dough, the less the cookies spread.
Scoop the cookies on to a light-colored baking tray lined with parchment paper. Be sure to leave at least 2 inches of space between each ball of dough to allow space for it to spread during baking.
Bake on the middle rack at 400°F for 8-10 minutes. If you enjoy a firmer cookie bake for the full 10 minutes; for a softer & chewier center bake for 8 minutes.
Allow the cookies to cool until at least barely warm before serving. Store in an airtight container and enjoy within a week for optimal freshness.
Have fun with the sprinkles! Using red and green sprinkle jimmies will make perfect Christmas sprinkle cookies! You can also use red, white and blue or black/brown and orange for 4th of July and Halloween.
Use a cool baking sheet each time if making a double batch. An already warm pan will cause the cookies to spread excessively.
Set a timer! An extra minute in the oven makes a big difference. For a softer more chewy center, bake the cookies for 8 minutes. If you prefer your cookies "well-done" like my sister-in-law, I find 10 minutes is the perfect time - don't worry the cookies won't be hard!