Easy Chocolate Cupcakes

Name: Easy Chocolate Cupcakes
Prep time: 5 min
Cook time: 20 min
Total time: 25 min
Cuisine: American
Ingredients: 1 cup (120g) AP flour; 1 cup (200g) granulated sugar; 1/2 tsp baking powder; 1/2 tsp baking soda; 3/4 tsp salt; 1 large egg (room temperature); 1/2 cup milk (room temperature); 1/3 cup (60g) canola oil (or other neutral oil); 2 tsp vanilla extract; 1 tsp white vinegar; 1/2 cup (50g) cocoa powder; 1 tsp ground espresso (optional); 1/4 cup boiling water