Peanut Butter Banana Upside-Down Cake

Ingredients

• 1 1/2 c. all-purpose flour
• 3/4 c. granulated sugar
• 2 tsp. baking powder
• 1/2 tsp. kosher salt
• 3/4 c. whole milk
• 1/2 c. smooth peanut butter
• 1/4 c. vegetable oil
• 1 large egg
• 1/4 c. (1/2 stick) butter
• 1/2 c. dark brown sugar
• 1 tsp. pure vanilla extract
• 5 ripe bananas, halved lengthwise

Directions

1. Preheat oven to 350°. In a medium bowl, whisk together flour, sugar, baking powder, and salt. In a large bowl, whisk milk, peanut butter, oil, and egg until well combined. 
2. Stir dry mixture into wet mixture until just combined. In a 10″ cast-iron skillet over medium heat, melt butter. Stir brown sugar and vanilla into butter and remove skillet from heat. 
3. Arrange banana slices on top, cut side down. Pour batter evenly over bananas and bake until just set, about 30 minutes.
4. Let cake cool in pan for 5 minutes, then carefully turn out onto a platter.