Preheat the oven to 375 degrees.

In a small bowl combine the flour, baking powder, baking soda, and salt. Set aside.

In a large bowl cream the butter, sugar, and brown sugar. Add in the eggs one at a time, stirring well after each addition. Add in the vanilla and mix well.

Add the flour mixture to the butter mixture and stir until a dough forms.

Fold in the M & M's and white chocolate chips.

Drop by heaping teaspoon onto an ungreased cookie sheet. Bake for 9-11 minutes or until golden brown. Remove from oven and allow to cool for 2 minutes before removing to a wire rack. Cool completely.