Preheat over to 400 Degrees. Line baking sheets with parchment paper or silicone mats.
Add cut up butter into mixer, mix until butter is somewhat softened.
Add sugars and mix on low until well combined.
Add creamy peanut butter, eggs, and vanilla and mix on low until well combined.
Sift together dry ingredients then slowly add to mixture while mixing on low. You may also choose to pulse the mixer on-and-off until dough ball forms. Make sure to scrape the sides and bottom of the bowl.
Measure dough mounds into 2.5-3 oz mounds for small cookies or 5 oz for large cookies.
Roll the cookie dough mounds into a bowl with 1/2 c granulated sugar. Roll until the whole mound is covered.
Place the cookie dough mounds 2 inches a part for small cookies or at least 3 inches apart for large cookies. Cookie dough mounds should be tall and not perfectly round.
Bake for 6-8 minutes, checking to see if the tops of the cookies are cracking and the tops starting to get browned.
Remove cookies from the oven and take the bottom of a seasoning bottle to make a round indentation into the top of the cookie (this is where you will put the filling and muddy buddy mixture) leave at least a 1/4 inch ring around the indentation.
Allow cookies to completely cool, they will finish baking on the warm cookie sheets.
While cookies cool, make the Muddy Buddy Mixture`