Preheat oven to 350 degrees.
Lightly grease a cookie sheet or line with parchment paper, set aside.
Add butter, peanut butter, granulated sugar and brown sugar to a large bowl and cream using a hand mixer or a stand mixer fitted with the paddle attachment. Mix on medium-high for about 1 minute, then scrape down the bowl once complete.
Add egg, mix until combined.
In a separate bowl, whisk together dry ingredients (flour, baking soda, baking powder, salt).
Add dry ingredients to wet ingredients in 2-3 portions, mixing after each addition.
Remove the bowl of chocolate ganache from the fridge (or your cookie sheet of chocolate dollops from the freezer). Make sure that the chocolate has set and can be spooned or peeled off of the parchment.
Use a cookie dough scoop or a spoon to scoop out a heaping dough ball (2-3 inches). Then flatten the dough out and place a spoonful of ganache in the center of the dough. Fold the dough over the ganache (ensure it is fully covered by cookie dough) and roll dough into a ball.
Rough the dough in sugar and place it on to baking sheet, leaving at least 1 inch in between each cookie.
Bake for 8-10 minutes or until the edges of the cookies just begin to crack.
Remove the cookies from the oven and let them cool for about 5 minutes before topping them.