In a mixing bowl, cream together the room-temperature unsalted butter, sugar, and brown sugar until light and fluffy. This will take about 2-3 minutes.
Stir in the vanilla bean paste and a pinch of kosher salt. Mix until combined.
Add the heavy cream to the mixture and mix well. Gradually add the all-purpose flour, stirring until just combined. Do not overmix. Set the cookie dough aside.
In a microwave-safe bowl, combine the brown sugar, butter, and a pinch of kosher salt. Microwave in 30-second intervals until the butter is melted and the mixture is smooth. Stir in the heavy cream.
Slowly whisk in the powdered sugar and vanilla bean paste until smooth. Then, add the Nutella and peanut butter, mixing until all ingredients are fully incorporated.
Finally, fold in the mini chocolate chips, ensuring they are evenly distributed throughout the fudge mixture.
Pour half of the fudge mixture into the prepared baking dish and spread it evenly. Crumble the cookie dough over the fudge layer, pressing it down gently. Pour the remaining fudge on top, smoothing it out with a spatula.
Refrigerate the fudge for at least 2 hours, or until set. Once firm, cut into squares and enjoy!