Cast Iron Skillet Chocolate Chip Banana Bread recipe

Ingredients

• ¼ cup unsalted butter
• ¾ cup light brown sugar
• 1 large egg, room temperature
• 3 medium ripe bananas, mashed (to equal 1 1/4 cups)
• 1 tsp pure vanilla extract
• 1 cup unbleached all-purpose flour
• 1 cup whole wheat pastry flour
• 1 tsp baking soda
• ½ tsp ground cinnamon
• ½ tsp salt
• 1 cup semisweet chocolate chips, divided