Line baking sheets with parchment paper or silicone liner, or spray with cooking spray.

In a large bowl, beat the butter and sugar for 2-3 minutes at medium speed, or until creamy. Add the eggs, vanilla, and cake batter extract. Beat until thoroughly combined.

In a small bowl, whisk together the flour, cornstarch, baking powder, baking soda, and salt. Set aside about a tablespoon of the sprinkles. Add the rest to the wet ingredients with the dry ingredients. Stir just until there are no streaks of flour.

Cover the dough and chill for at least 30 minutes.

When ready to bake, preheat your oven to 375 degrees.

Scoop about 1 1/2 tablespoons of dough (about an ounce) and shape it into a ball. Repeat with the rest of the dough.

Dip the tops of the dough balls into the reserved sprinkles. Place on prepared cookie sheets at least 2 inches apart. Bake at 375° for 10-12 minutes, until the edges are barely golden brown.

Let cookies sit on the pan for 2-3 minutes, then transfer to a cooling rack to cool completely.