Banana Bread Lava Cake

Ingredients

• 8 tablespoons unsalted butter, melted, plus more, to taste, for greasing the dish
• 1 1/4 cups all-purpose flour, plus more, to taste, for dusting the dish
• 1/2 teaspoon baking powder
• 1/2 teaspoon baking soda
• 1/2 teaspoon kosher salt
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon ground allspice
• 1/4 teaspoon ground ginger
• 1/2 cup granulated sugar
• 1/2 cup light brown sugar
• 1/2 cup banana, peeled and mashed
• 1/4 cup sour cream
• 2 large eggs
• 1 teaspoon pure vanilla extract
• 2 frozen chocolate-coated vanilla ice cream bars, such as Klondike®