In a large mixing bowl combine the margarine and vegetable shortening. Use an electric mixer or the paddle attachment on a stand mixer to cream together.
⅔ c margarine, ⅔ c vegetable shortening
Add the eggs, sugar, brown sugar and vanilla to the wet mix. Mix on medium speed until light and fluffy.
2 eggs, 1 cup brown sugar, 1 teaspoon vanilla extract, 1 cup granulated sugar
Slowly add the dry flour mixture a cup at a time. Stir in the chocolate chip cookies by hand. Let the dough rest for 10 minutes.
2 cups chocolate chips
Drop by rounded spoonfuls onto cookie sheets. Bake for 5 and half minutes, turn and bake for an additional 4 and half minutes.
Allow cookies to cool on the cookie sheets for 5 minutes. Then move to a wire rack.