Creating Peanut Butter Stuffed Brownies can be straightforward if you follow these simple steps:

1. Preheat Your Oven: Set your oven to 350°F (175°C). Grease and line a 9×13-inch baking pan with parchment paper for easy removal.
2. Melt Butter: In a medium saucepan, melt the unsalted butter over medium heat. Once melted, remove from heat and let it cool slightly.
3. Mix Sugar and Eggs: In a large bowl, whisk together the granulated sugar and eggs until well combined. Add the vanilla extract and mix.
4. Combine Wet Ingredients: Pour the melted butter into the egg mixture and stir until fully incorporated.
5. Add Dry Ingredients: Sift together the flour, cocoa powder, baking powder, and salt. Gradually fold the dry ingredients into the wet mixture until just combined. Avoid overmixing.
6. Prepare Peanut Butter Filling: In a separate bowl, mix the creamy peanut butter with powdered sugar until smooth and well incorporated.
7. Assemble Brownies: Pour half of the brownie batter into the prepared baking pan. Spread evenly. Next, dollop spoonfuls of the peanut butter mixture over the brownie base. Use a spatula to spread it gently, but leave some gaps for the brownie batter to rise.
8. Top with Remaining Batter: Pour the remaining brownie batter over the peanut butter layer, spreading it gently to cover as much as possible.
9. Add Chocolate Chips (Optional): If desired, sprinkle chocolate chips on top for added sweetness and texture.
10. Bake: Place the pan in the preheated oven and bake for 25-30 minutes. A toothpick inserted into the center should come out with a few moist crumbs.
11. Cool: Remove from the oven and let the brownies cool in the pan for about 15-20 minutes. Then transfer to a wire rack to cool completely before cutting.

These steps will guide you in creating these incredible brownies effortlessly.