Preheat oven to 375° F.
Cream together butter or margarine and 3/4 cup sugar. Add egg, vanilla or custom flavour and food colouring. Mix well.
In a separate bowl, mix flour, baking soda and powder. Add to wet mixture and mix until incorporated, being careful not to over mix. If the dough is too crumbly and won't come together, knead by hand for a minute or two.
Using an ice cream scoop, divide dough into 12 equal portions. Roll into balls and coat tops by pressing into sugar. Spread evenly on 2 parchment lined baking sheets. Gently press down to flatten dough to about 3/4" thick.
Bake each sheet separately for 13 to 15 minutes at 375° F.
Cool on baking sheet for 5 minutes, then remove and place on wire rack to cool completely.
