Mix dry ingredients: In a large mixing bowl, combine all-purpose flour, cocoa powder, baking powder, baking soda, and salt. Whisk together until blended.

Cream butter and sugar: Beat softened butter and granulated sugar until light and fluffy, about 2-3 minutes.

Incorporate wet ingredients: Add eggs (or flax eggs) and vanilla extract to the mixture, beat until combined and smooth.

Combine mixtures: Gradually alternate adding dry ingredients and buttermilk, mixing gently until just combined.

Add water: Pour in hot water, stirring gently until the batter is glossy and slightly thin.

Bake: Preheat oven to 350°F (175°C), pour batter into greased pan, and bake for about 30 minutes.

Cool bars: Allow the bars to cool completely in the pan for about 30-40 minutes.

Prepare frosting: Whip heavy cream or coconut cream until soft peaks form, then gradually add powdered sugar until smooth.

Add coconut and color: Fold in shredded coconut and pink food coloring into the frosting mix.

Frost and slice: Spread frosting over cooled bars and cut into squares to serve.