Combine flour, sugar, baking powder, cinnamon and salt in a large bowl
In another bowl, whisk milk and instant coffee until powder is dissolved
Add the melted butter, egg, and vanilla extract into the milk/coffee mixture
Stir the wet ingredients into the flour mixture
Fold in chocolate chips
Preheat oven to 375°F
Grease or line your muffin pan and fill each cup 3/4 of the way with muffin mixture
Bake for 17-20 minutes, or until they've passed the toothpick test