Preheat the oven to 400 degrees. Line 2 muffin tins with paper liners and set aside.
In a large bowl, combine the flour, sugar, cocoa powder, baking soda and salt. Whisk by hand to combine, about 30 seconds.
Fold in the chocolate chips.
In a large measuring cup mix the egg, sour cream, coffee, vanilla and oil until incorporated, about 1 minute with a fork.
Pour the egg mixture into the dry ingredients.
Gently whisk until the ingredients have fully incorporated and the batter has formed.
Fill the prepared baking liners 2/3 full with batter.
Bake in the preheated oven for 5 minutes.
Reduce the temperature to 350 degrees and continue to bake for 10 to 15 minutes, or until a toothpick comes out clean.
Remove from the pan and enjoy.