Preheat your oven to 350°F (175°C) and line two baking sheets with parchment paper.

In a large mixing bowl, cream together the softened unsalted butter and creamy peanut butter until smooth. Gradually add granulated sugar and brown sugar, mixing until fluffy.

Add the egg and vanilla extract to the mixture, and mix until just combined.

In another bowl, whisk together flour, baking soda, and salt. Gradually incorporate the dry ingredients into the wet mixture until no flour streaks remain.

Gently fold in the chocolate chips and chopped peanuts, ensuring an even distribution in the dough.

Drop rounded balls of dough onto prepared baking sheets, leaving space between each cookie. Bake for 10 to 12 minutes, or until edges are lightly golden.

Allow cookies to cool on the baking sheets for 5 minutes before transferring to a wire rack to cool completely.