• Place the egg in a bowl of warm water for 5 mins (to bring it to room temperature)
• Preheat the oven to 350F then line a baking sheet with parchment paper and set it aside.
• Cream the butter, granulated sugar, and powdered sugar together until smooth and creamy.
• Remove the egg from the bowl of warm water, crack it and beat it and the vanilla extract until combined.
• Add in the dry ingredients (flour, baking powder and salt) and mix until just combined.
• Use a large cookie scoop and scoop out 8 equally sized cookie dough balls.
• Roll the dough into balls and then roll the balls in the sprinkles.
• Flatten the cookies to ¾ inch thickness
• Bake for 12-13 min until lightly golden on the edges
• Remove from the oven and let sit on the baking sheets for at least ten min before removing to a cooling rack to fully cool down.

Make the cake flavored buttercream

• Using a hand or stand mixer, cream the butter until smooth.
• Add powdered sugar, cake batter extract and heavy cream.
• Beat for 2 mins on low speed and beat on HIGH for 4 mins creating a very light and fluffy buttercream.

Decorating

• Add the frosting to a piping bag fitted with a Tip 10 or 12
• Starting in the center of the cookie, pipe a dot and then make a tight circle around it. Continue this until the cookie is fully frosted. Immediately top with sprinkles.