Preheat the oven to 350F. Line two baking sheets with parchment paper or silicone mats.
Beat the butter, sugar, and salt until light and fluffy, in a large bowl. You can use a whisk or a mixer set on medium speed. Add the peanut butter and mix it well.
Mix the flour and cocoa powder together and add them to the batter. Mix until well combined.
Scoop the dough and roll it into 1-inch balls. Place them on the prepared baking sheets.
Bake the cookies for 12-15 minutes until the bottoms get golden brown. Let them cool completely on the baking sheet.
Place the powder sugar on a plate and roll each cookie in it until well coated.
Notes
What kind of peanut butter to use?Use the peanut butter you have available. If you want more texture, use chunky peanut butter. If you are allergic to peanut butter, replace it with cashew butter, almond butter, sunflower butter, etc.Can I freeze the batter to make cookies later? Yes, you can. The batter is good for up to three months in the freezer.Can I freeze the cookies? Yes, you can freeze them for up to 4 weeks. After baking the cookies, allow them to cool completely. Do not roll them through powder sugar. Place them in a single layer on a parchment-lined baking sheet to freeze them, then store them in a freezer storage bag for up to a month. When ready to eat them, thaw them at room temperature. Toss them in powder sugar and serve.