Banana Nutella Swirl Cake with Nutella Frosting

INGREDIENTS

For the cake:

2 cups

all-purpose Gold Medal flour

1 tsp

baking soda

1/4 tsp

salt

1/2 cup

unsalted butter, at room temperature

1 1/2 cups

granulated sugar

large eggs

1 cup

plain Greek yogurt (I used Chobani 0%)

1 tsp

vanilla extract

ripe bananas, peeled and mashed (to equal 1 cup)

1/2 cup

Nutella

For the Nutella Frosting:

1/2 cup

unsalted butter, at room temperature

1 cup

Nutella

1 1/2 cups

powdered sugar

2 tbsp

milk

1/2 tsp

hazelnut extract, optional