Add butter, sugar, egg, egg yolks and vanilla to a mixer bowl and beat until creamy about 2 minutes.

Next, add flour, baking powder and salt.

Mix just until combined.

Divide dough in half and wrap in plastic wrap. 

Chill for about 30 minutes. If you are in a hurry and do not have time to chill the dough, it will still roll out just fine but it will be a little harder to handle after cutting into shapes. 

Preheat oven to 350°.

Remove from refrigerator, unwrap and place on a flour dusted cutting board. 

Roll dough to about 1/4 inch thickness with a rolling pin. 

Use cookie cutters to cut cookies into desired shapes. 

Place about 2 inches apart on a silpat or parchment lined baking sheet. 

Bake for about 10- 12 minutes. 

Remove to a wire rack to cool completely.