Place the cocoa powder, flour, baking powder and salt(optional) in a large mixing bowl and stir with a whisk.
Mix the eggs and sugar in a medium bowl with a whisk until combined.
Add the melted butter, milk, vanilla extract and mix until all combined.
Pour wet mixture into dry ingredients and stir. Once almost combined, add the hot water and stir until just combined.
Pour the batter into loaf pan and bake until a toothpick comes out clean that is inserted in the center. Few moist crumbs are fine.
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