Preheat oven to 350°F. Line a baking sheet with parchment paper or leave it ungreased.
In a medium bowl, combine 1 cup creamy peanut butter, 1 cup granulated sugar, 1 egg, 1 egg white, 1/4 tsp baking soda, and 1/2 tsp vanilla. Stir until the mixture is well combined and smooth.
Divide the dough into 16 equal portions (use a cookie scoop or spoon) and place them on the prepared baking sheet, spacing them about 2 inches apart. Press the tops of the dough portions slightly flat so each will have a flat surface for a peanut cluster.
Bake for approximately 10 minutes, until the edges are set.
Remove the baking sheet from the oven and immediately place 1 Brach's Sea Salt Caramel Peanut Cluster on top of each cookie (use all 16 clusters), pressing gently so the cluster adheres to the warm cookie.
Allow the cookies to cool completely on the baking sheet so the clusters set before moving or serving.