Preheat oven to 400°F/200°C. Line 2 standard or one jumbo muffin tin with paper liners.
In a large mixing bowl, whisk together cocoa, flour, baking soda, baking powder, and salt until well combined.
In a 2 cup measuring cup, add warm water and stir in the instant coffee until dissolved. Make a well in the center of the dry ingredients and pour in the water/coffee mixture, brown sugar, oil, vinegar, vanilla, and eggs. Whisk until just combined, then fold in half of the chocolate chips.
Scoop batter into the prepared muffin tins and sprinkle the remaining chocolate chips on top.
Bake standard size muffins for 15-17 minutes and jumbo muffins 22-25 minutes or until a toothpick inserted in the center comes out clean. Cool on a wire rack and dust with confectioners’ sugar.