Make the Brownie Batter:

Preheat Oven:

Preheat your oven to 350°F (175°C). Grease a mini muffin tin or line it with mini cupcake liners.

Mix Wet Ingredients:

In a large bowl, whisk together the melted butter, granulated sugar, brown sugar, eggs, and vanilla extract until smooth.

Combine Dry Ingredients:

In a separate bowl, whisk together the cocoa powder, flour, baking powder, and salt.

Combine Batter:

Gradually add the dry ingredients to the wet mixture, stirring until just combined.

Prepare the Peanut Butter Filling:

Mix Filling:

In a small bowl, mix the peanut butter and powdered sugar until smooth.

Assemble the Brownie Bites:

Fill the Tin:

Spoon a small amount of brownie batter into each mini muffin cup, filling about halfway.

Add Peanut Butter:

Drop a small dollop (about 1/2 teaspoon) of the peanut butter filling in the center of each cup.

Top with Batter:

Cover the peanut butter filling with a little more brownie batter, filling the cups about 3/4 full.

Bake:

Bake:

Bake in the preheated oven for 12-15 minutes, or until the edges are set and the tops look slightly cracked.

Cool:

Allow the brownie bites to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.