Put oven rack in center of the oven and preheat to 375°F.￼
In medium bowl mix flour, baking soda and baking powder then set aside.￼
In a large bowl use an electric hand mixer to combine softened butter and sugar￼.
Add softened margarine and beat until creamy.￼
Beat in egg and vanilla.
Slowly beat in flour mixture.￼
Using about a teaspoon sized amount of dough, roll the dough between your hands to shape it into a ball.
Place dough balls onto a nonstick cookie sheet
Bake in the oven for 7 to 9 minutes.￼
Let cool on pan for 2 to 4 minutes before transferring to cooling rack￼.