Commence by preheating your oven to a temperature of 350 degrees Fahrenheit.

Proceed to grease a 12-cup cupcake pan or, alternatively, a mini muffin tin should you desire bite-sized portions.

Prepare the brownie mix in strict accordance with the instructions provided on the packaging.

Utilizing an ice cream scoop or a similar utensil, distribute the brownie mixture evenly into the prepared tin to ensure uniformity in size.

Bake the brownies in the preheated oven for approximately 20 minutes. The baking is considered complete when a cake tester inserted into the center of a brownie emerges mostly clean, albeit with a few crumbs attached.

After baking, allow the brownies to cool for a brief period. Subsequently, use the back of a spoon to gently create an indentation in the center of each brownie.

Melt the peanut butter in a microwave oven for 30 seconds, then stir it until it attains a smooth consistency.

Carefully spoon a small quantity of the melted peanut butter into each indentation previously made in the brownies.

Garnish the brownies by adding both chocolate and peanut butter chips on top.

Allow the brownies to cool completely in the pan before transferring them to a wire rack. This process is necessary for the brownies to firm up.

Store the brownies in a sealed container to maintain freshness, unless they are to be consumed immediately.