Chocolate Nutella Espresso Mug Cake

So I originally found this recipe here and I instantly fell in love. It's such a wonderful idea for a snack for one or two and look how cute it is! So I figured I'd make my own version.

For one mug:
1 egg
1 1/2 tbsp. canola oil
2 tbsp. milk
3 tbsp. Nutella
1 heaping tsp. espresso powder or instant coffee powder (less if you're not into a strong espresso flavour)
3 tbsp. cocoa
2 tbsp. sugar
3 tbsp. flour

Directions:
1. With fork, whisk egg and add coffee powder and oil, mix well.
2. Add cocoa and coffee powder, mix well, again.
3. Add the Nutella, and really mix well, because it's thicker.
4. Add the sugar, flour, and milk, mix until creamy.
4. Microwave on high for 2.5-3 minutes. Once cooled add whipped cream and strawberries or some white chocolate and caramel. Enjoy!