Preheat the oven to 350 degrees. Butter a 9×13 baking dish.

In small saucepan over low heat, melt butter completely. Stir in sugar and continue cooking for 1-2 minutes, stirring constantly. Do not allow sugar mixture to boil. Add the chocolate chips and stir until melted.

Pour butter mixture into a large bowl or stand mixer and beat in coconut milk, eggs, and vanilla extract.

In a separate bowl, combine the cocoa powder, salt, baking powder, and flour. Gradually add to the wet mixture and mix until well combined.

Pour into prepared pan. Bake for about 35-45 minutes, until a tester comes out mostly clean. Let cool on a wire rack until completely cool.

While the brownies are baking, make the frosting by whipping the butter until lighter in color. Add the vanilla and coconut milk and beat until combined. Slowly add the cocoa powder and mix until combined. Add the powdered sugar 1/2 cup at a time until frosting has reached desired consistency.

Spread over brownies once completely cooled.