Beat together the butter and sugar until fluffy. Add in egg yolks one at a time, beating well after each addition. Mix in vanilla.

In another bowl mix together the flour, salt and gum. Add to the egg mixture, blending until smooth.

Spoon into the cookie press (or pastry bag), and press into desired shapes onto a silicone lined or baking pan. If desired, place a chocolate chip into the center of each 'flower'.

Chill cookies on pan for 20 minutes before baking. This will allow the flours to absorb the moisture, making the cookies less gritty.

Bake at 400°F for 7-9 minutes, or until edges just start to turn a light golden. Allow to cool 5 minutes on pan before moving to wire rack.