In a mixing bowl, cream the butter, peanut butter and sugars. Add vanilla and mix. Add the eggs, one at a time, beating well after each addition.
In a separate bowl, mix the flour, baking soda and salt. Add to mixture in mixing bowl and mix until well combined.
Roll the dough into 1" balls, then roll in sugar. Place onto a non-stick baking mat.
Refrigerate the cookies for 30 minutes.
Spray mini muffin tins with cooking spray, then place a cookie dough ball in each muffin cup.
Bake the cookies at 375 degrees for about 8 minutes. If you like cookies to be soft, be sure not to overbake them. They shouldn't be browned at all.
As soon as the cookies come out of the oven, press the peanut butter cups into the center of the cookie.
Allow the cookies to cool for about 10-15 minutes in the pan, then loosen the cookies and move them to a wire rack to cool completely.
Store the cookies in an airtight container.
Notes
The calories shown are based on the recipe making 48 cookies, with 1 serving being 1 cookie. Since different brands of ingredients have different nutritional information, the calories shown are just an estimate. **We are not dietitians and recommend you seek a nutritionist for exact nutritional information.**