Preheat the oven to 350?F (175?C) and grease the baking pan.

In a mixing bowl, combine melted butter and sugar, whisking until smooth.

Add eggs and vanilla extract, mixing well.

In another bowl, sift together cocoa powder, flour, salt, and baking powder.

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

Pour the brownie batter into the prepared baking pan and spread evenly.

Bake in the preheated oven for 20-25 minutes, or until a toothpick inserted comes out with a few moist crumbs.

Remove from oven and let cool for 10 minutes.

Sprinkle mini chocolate eggs on top while the brownies are still warm.

Allow to cool completely before cutting into squares.