Cake:

2 small overripe bananas, mashed (about 3/4 cup)
1 cup all purpose flour
1/4 cup granulated sugar
1 medium egg
3 tbsp canola oil
1/2 tsp baking soda
1/2 tsp baking powder
1/2 tsp salt
1/2 tsp vanilla extract

Salted Vanilla Buttercream:

1/4 cup butter, softened to room temp
2 cups powdered sugar
1/2 tsp vanilla
1 tbsp milk
1/2 – 1 tsp salt (start with less, taste as you go)