If you are a fan of soft-baked cookies, these Soft Baked Reese's Pieces Cookies can't be beat. They are fabulously soft with plenty of chocolate and peanut butter flavor.
In a large bowl, whisk together melted butter, brown sugar, and granulated sugar.
Whisk in egg, egg yolk, and vanilla extract.
Add the flour, cornstarch, baking soda, and salt and stir until combined.
Stir in milk chocolate chips and1/2 cup of Reese's Pieces.Cover with plastic wrap and refrigerate at least 3 hours. Overnight is even better.
Preheat oven to 325 degrees and line 2 baking sheets with parchment paper.
Shape dough into balls a little bigger than a golf ball. You should get 15 to 16 cookies.
Press a few Reese's Pieces into the top of each dough ball.Bake for 11 to 12 minutes. Cookies will still look a little underdone.Let cool 5 minutes on baking sheet and then remove to a wire rack to cool completely.