In a mixing bowl, add the brown sugar and corn starch. Whisk together until they are combined and there are no more lumps.
Add in the butter. Turn the mixer on medium and beat until light and fluffy. Scrape the sides of the bowl.
Add in the vanilla and eggs. Beat until the eggs are thoroughly incorporated into the cookie dough. Scrape the sides of the bowl.
Add in the flour and baking soda. Turn the mixer on low and mix until the flour is almost combined. Scrape the sides of the bowl. Turn the mixer on medium and mix until the flour is completely incorporated.
Add in the candies and mix them in with a spatula.
Place the dough into the refrigerator for about an hour or until the dough is very firm.
Using a medium sized cookie scoop, scoop the cookies onto an ungreased baking sheet.
Place in the oven and bake for 10-12 minutes or until the edges are golden brown.
Place on a cooling rack to cool. These are outstanding warm.