Put oven rack in center of the oven and preheat to 375°F.

In medium mixing bowl, combine flour, baking soda, and baking powder using a whisk, then set aside.

In a large mixing bowl, use an electric mixer to combine softened butter and sugar.

Add softened margarine and beat until creamy.

Beat in egg and vanilla extract completely.

Slowly beat in flour mixture.

Using about a teaspoon sized amount of dough, roll it between your hands to make balls.

Place dough balls onto nonstick cookie sheet.

Bake in oven for 7-9 minutes.

Remove pans and let cool for 2 minutes before transferring cookies to a cooling rack.