In a large bowl cream butter and sugar until light and fluffy.
Stir in oil, eggs, vanilla, cake batter extract, cornstarch, baking powder, baking soda, and salt.
Gradually add flour and stir until just combined. Fold in sprinkles.
Chill dough for 30-60 minutes.
Preheat oven to 350 degrees F. Line baking pan with parchment paper.
Using a large cookie scoop place dough onto prepared pans. Press down slightly with your hand or the back of a glass. Bake for 12-15 minutes. Cool completely.
For the Frosting
Cream butter, salt, vanilla extract, and cake batter extract. Gradually stir in powdered sugar and add milk until you reach your desired consistency.
Spread or pipe frosting onto cookies. Garnish with sprinkles and enjoy!