Preheat the oven to 350°F (175°C). Grease a 9x13-inch baking pan or line it with parchment paper.

In a large mixing bowl, combine the melted butter, granulated sugar, and brown sugar. Mix until well combined.

Add the eggs one at a time, mixing well after each addition, then stir in the vanilla extract.

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

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

Fold in the chocolate chips, shredded coconut, and chopped pecans.

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

Bake for 25-30 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs.

Allow the brownies to cool in the pan for at least 15 minutes before cutting into squares.