1-First: mix equal parts creamy peanut butter and confectioners’ sugar to make the filling, roll it into small balls, and freeze for at least one hour. This step is crucial for that gooey center.

2-Next: melt the semi-sweet chocolate bars with unsalted butter to create a rich base for the dough.

3-Then: combine the melted mixture with all-purpose flour, cocoa powder, espresso powder if using, baking powder, salt, brown sugar, granulated sugar, eggs, and vanilla extract to form a brownie-like batter. Chill this dough for one hour to make it easier to handle. To shape each cookie, take a tablespoon of chilled dough, roll it into a ball, make an indentation, add a frozen peanut butter ball, cover with more dough, and roll to create that marbled look.

4-Preheat your oven to 350°F (177°C) and line a baking sheet with parchment paper. Scoop the shaped dough onto the sheet, leaving space between each. Bake for 12 to 13 minutes until the edges set but the centers stay soft, then cool on the sheet for 10 minutes before moving to a rack. Remember to adapt for dietary swaps, like using flaxseed for eggs in vegan versions, and adjust baking times as needed.