Preheat oven to 350°F (175°C). Grease or line a mini muffin pan.
In a large bowl, cream together butter, peanut butter, brown sugar, and granulated sugar until smooth.
Beat in the egg and vanilla extract.
In a separate bowl, whisk together flour, baking soda, and salt. Gradually mix the dry ingredients into the wet mixture until combined.
Roll the dough into 1-inch balls and place each ball into the mini muffin pan.
Bake for 8-10 minutes, or until the edges are lightly golden. Immediately press a mini peanut butter cup into the center of each cookie while they’re still warm.
Let the cookies cool in the pan for a few minutes, then transfer to a wire rack to cool completely.
Prep Time: 15 minutes | Cooking Time: 10 minutes | Total Time: 25 minutes | Kcal: 130 per cookie | Servings: 24 cookies
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