Preheat the oven to 350 degrees.

In a large bowl cream together the butter, sugar, and brown sugar.

Stir in the eggs and vanilla and mix well. Set aside.

In a medium bowl combine the flour, baking soda, cornstarch, and salt.

Pour the flour mixture into the butter mixture and mix well to combine.

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

Use a 1 1/2 inch cookie scoop and scoop dough onto a cookie sheet spacing them 2 inches apart.

Bake for 10-12 minutes.

Remove from the oven and cool 2 minutes. Transfer to a wire rack to cool completely.