Preheat oven to 350 degrees
Mix together all wet ingredients in a large bowl until smooth
Pour in dry ingredients and mix
Pour batter into an 8x8 baking dish lined with parchment paper
Bake for 35-40 minutes
Let cake cool for at least 1 hour, then pop in the fridge for at least 15 minutes to ensure it is completely cool
Add all frosting ingredients to a bowl with a hand mixer or tabletop mixer
Beat on medium high until light and fluffy
Spread frosting on cake
