Begin by beating the softened butter with the powdered sugar in a large mixing bowl for about 3-4 minutes until the mixture is light and fluffy.

Gently incorporate the sifted flour and cornstarch into the mixture until they are just blended, taking care to avoid overmixing.

Form the dough into 36 equal-sized balls and arrange them on a baking tray lined with parchment paper or on a floured plate to stop them from sticking. Use a fork with cornstarch or flour to lightly flatten each ball and add sprinkles on top.

Chill the cookie balls in the fridge for around 2 hours or until they are firm. If you're short on time, you can use the freezer but keep an eye on them.

While the cookies are chilling, preheat your oven to 300°F. Typically, I bake 12 cookies per tray!

Bake the cookies in the preheated oven for approximately 19-20 minutes, or until the tops are set.

Allow the cookies to cool on the tray before serving them!