Mini Chocolate Layer Cakes

INGREDIENTS

!For the chocolate cake:

1 1/2 cups

all-purpose flour

1 cup

granulated sugar

3 tbsp

unsweetened cocoa powder

1 tsp

baking soda

1/2 tsp

instant espresso powder

1/2 tsp

salt

6 tbsp

canola oil

1 tsp

vanilla extract

1 tbsp

white vinegar

1 cup

cold water

!For the frosting:

1 stick

unsalted butter, softened

2 1/2 cups

powdered sugar

1/4 cup

unsweetened cocoa powder

2 tsp

vanilla extract

2 tsp

milk (as needed for consistency)