1/2 tsp. Pure vanilla extract
1 tbsp. Milk
1/2 cup Powdered sugar
1/2 cup Rainbow sprinkles
1/2 cup White chocolate chips
3 Super-ripe bananas, mashed with a fork
1 Large egg yolk
1 Large egg
1 tsp. Pure vanilla extract
1/4 cup Buttermilk
3/4 cup Sugar
1/4 tsp. Kosher salt
1 tsp. Baking soda
1 cup All-purpose flour, plus more for pan
1/2 cup Melted butter, plus more for pan