Preheat the oven to 350 degrees F. Line a 13×9-inch baking dish with parchment paper. Set it aside.
In a medium sized saucepan, melt butter over medium heat. Once melted, remove the pan from heat and add chocolate chips and granulated sugar. Stir until the chocolate is completely melted.
Add eggs, one at a time, combining completely after each addition. Add vanilla and stir until blended.
Add the cocoa powder, flour, salt, and baking powder. Using big strokes, stir just until mixed and dry ingredients are no longer visible.
Pour batter in the prepared baking dish. Bake the brownie layer for 23-25 minutes.
While brownies are baking, make peanut butter filling. In a mixing bowl, combine melted butter, peanut butter, vanilla, and powdered sugar. Beat until combined.
Remove brownies from oven when done baking. Gently drop peanut butter filling onto top of warm brownies, using fingertips to make sure brownies are completely covered.
For the ganache, in a small microwave-safe bowl, combine chocolate chips and heavy cream. Heat for one minute. Stir until smooth. Pour over peanut butter layer and spread until evenly distributed.
Refrigerate brownies for 2 hours (or more). Cut into bars while chilled. Serve and enjoy!!
PREP TIME & NUTRITION:
Prep Time: 30 minutes, Cook Time: 25 minutes, Total Time: 2 hours 40 minutes, Servings: 32 brownies, Calories: 227, Net Carbs: 20g, Fats: 16g, Protein: 4g