Step 1

Preheat the oven to 350°F and line a baking sheet with parchment paper.

Step 2

Combine the room temperature butter, peanut butter, and brown sugar in a small bowl. Use a fork to mix together until smooth.

Step 3

Add the egg yolk and vanilla extract and mix well.

Step 4

Add the flour, salt, and baking soda and use a rubber spatula to fold everything together until smooth and no streaks of flour remain.

Step 5

Use a 1.5-ounce cookie scoop to scoop out two large cookies. If desired, roll in some granulated sugar.

Step 6

Place on the prepared cookie sheet two inches apart.

Step 7

Bake for 11 minutes or until the cookies have puffed up and are set on the edges but are still slightly gooey in the middle.

Step 8

Allow to cool completely before eating! Enjoy!