In a large mixing bowl, whisk together peanut butter and brown sugar.
Add egg and whisk well.
Line a baking sheet with parchment paper.
Preheat oven to 350 degrees F.
Scoop cookie dough with a medium size cookie scoop (1 and 1/2 tablespoon size) and place on prepared baking sheet.
Bake cookies for 10 to 11 minutes. Cool on sheet for 5 minutes. Remove onto cooling rack.
In the meantime, melt chocolate chips in microwave safe bowl. It helps to add 1/2 teaspoon of vegetable or coconut oil. Stir until smooth.
Once completely cooled, dip cookies in melted chocolate and sprinkle with chopped peanuts.
Place back on sheet to let the chocolate set.