Preheat oven to 375F degrees.

In a large bowl, whisk together flour, baking soda, and salt. Set aside.

In a large bowl using an electric mixer, cream together butter, peanut butter, and sugars. Add vanilla extract; stir until well combined.

One at a time, beat in each egg until well combined.

Slowly add flour mixture to wet ingredients; mix until well combined.

Scoop dough into 1 inch balls, or use a #60 disher to scoop balls of dough. Place on ungreased cookie sheet, or silicone mat/parchment paper lined cookie sheet. Flatten the balls with a fork.

Bake for 5-7 minutes. Do not over-bake. Cookies will set as they cool.

Cool cookies on cookie sheet for 3 minutes; transfer to a wire rack to cool completely.

In a large bowl using an electric mixer, cream together peanut butter, powdered sugar, vanilla extract, and milk until well combined.

Spread the peanut butter filling on half of the cookies and top each one with another cookie. Eat & Enjoy!