Preheat the oven to 375˚F. Line a baking sheet with parchment paper and set aside.
In a medium bowl, mix together the flour, cocoa and baking soda until fully combined.
In a separate bowl, beat together the sugars, butter and 1/4 cup peanut butter until light and fluffy. Add the egg and vanilla and beat until fully combined. Stir in the flour mixture until fully incorporated and set aside.
In a medium bowl, mix together the icing sugar and 3/4 cup of peanut butter until smooth.
Take around 1 Tbsp of cookie cough and flatten with your palm. Place around 1-2 tsp of peanut butter filling in each then roll chocolate cookie dough over the peanut butter to close. Roll the cookie ball in sugar. Place the cookies on the prepared cookie sheet.
Bake for 7-9 minutes. Let stand on baking sheet for 2 minutes, then move to wire racks to cool.