Step 1

Preheat the oven to 300F degrees and line cookie sheets with parchment paper or baking mats.

Step 2

In a large bowl beat the butter and powdered sugar until very fluffy and aerated (at least 5 minutes.

Step 3

Mix in the flour, cornstarch, salt and vanilla extract.

Step 4

Dust your hands with cornstarch, then form the dough into balls about 2 teaspoons to 1 tablespoon in size.

Step 5

Place on the lined cookie sheets and press down the top of each cookie with the tines of a fork dipped in cornstarch (this prevents sticking). Add a few sprinkles to the top of each cookie.

Step 6

Bake for 14-16 minutes, or until the tops look set.