Preheat the oven to 350 degrees F. Line a baking sheet with parchment paper or a silicone baking mat. Set aside.

Mix the peanut butter and sugars together until creamy and smooth.

Add in the egg and vanilla extract. Mix until well combined.

Stir in the salt, baking soda, and Reese's Pieces candy.

Spoon dough into balls, about 1 Tablespoon of dough for each cookie. Place them on the baking sheet, about 2 inches apart. Lightly flatten dough balls with the palm of your hand.

Bake cookies for 10-12 minutes, or until cookies are slightly golden brown around the edges. The cookies will still be soft. They will set up while cooling.  Remove from oven and let cool on baking sheet for 2 minutes. Transfer to a cooling rack.