Chocolate Chunk Drops

Shortbread and chocolate, doesn't get much better than this!

2 cups butter, softened
1 cup granulated sugar
3 1/4 cups all purpose flour
1/2 cup cornstarch
1 1/2 cups coarsely chopped milk or semi sweet chocolate
Icing sugar for dusting

1. Preheat oven to 300F.  Line baking sheets with parchment paper.
2. Cream butter in a large bowl of an electric mixer on medium high speed until sugar is completely combined, about 2 - 3 minutes.
3. Combine flour and cornstarch in a separate large bowl.  Add to butter mixture on low speed until well combined.  Add chocolate chunks.
4. Place dough by 1 heaping tbsp 2" apart on prepared baking sheet.
5. Bake in preheated oven, 25-30 minutes.  Cool on wire cooling rack.
6. Dust cooled cookies with icing sugar.