Preheat the oven to 350 Fahrenheit.
Grease and line an 8x8 baking pan with parchment paper and set aside.
In a mixing bowl, beat (with an electric mixer on low speed) all wet ingredients aside from the hot coffee until smooth.
Beat in the dry ingredients, and as it is mixing, slowly pour in the coffee.
Beat on low speed until a smooth batter forms, about 30 seconds.
Transfer to the prepared baking pan. Bake for 28-32 minutes or until a toothpick comes out clean. Mine is perfect at 30 minutes but all ovens are different.
Let cool in the pan for 15 minutes, then lift out and transfer to a wire rack to finish cooling.
Meanwhile, beat the room temperature butter on low/medium speed for 30 seconds. Beat in the cocoa powder, vanilla and salt.
Slowly add in the powdered sugar, and milk or cream on low speed. Start with 2 tablespoons of milk/cream and add more as needed or to reach your desired consistency.
Once the cake is cool, add the frosting on top, then add berries, sprinkles, chocolate shavings, whatever you like!