Banana Poppy Seed Cake with Vanilla Bean Frosting

INGREDIENTS

the cake

2 tbsp

unsalted butter, at room temperature

2/3 cup

sugar

1/2 cup

sour cream

large egg

ripe bananas, mashed

1/2 cup

poppy seeds

1 tbsp

vanilla extract

1 cup

flour

1/4 tsp

salt

1/2 tsp

baking soda

the vanilla bean frosting

to 4 ounces of cream cheese, at room temperature (about half the 8 oz package)

2 tbsp

unsalted butter, at room temperature

the seeds from 1 vanilla bean

2 cups

confectioner's sugar, sifted

milk or cream for thinning the icing

squeeze of fresh lemon juice