M&M COOKIE BARS

1 cup butter

1 cup sugar

1 cup brown sugar

2 large eggs

1 large egg yolk

2 teaspoons vanilla

3 cups all-purpose flour

1 teaspoon baking soda

1 teaspoon cornstarch

1 teaspoon kosher salt

1 1/2 cups semi-sweet chocolate chips

1 1/2 cups M&Ms

Set oven to 350 degrees. Line 9-by-13 pan with parchment paper or foil. Combine butter, sugar and brown sugar. Add eggs, egg yolk and vanilla. Add flour, baking soda, cornstarch and salt; fold in chocolate chips and M&Ms. Press into pan and bake for 35 minutes.