Banana Bread Lava Cake

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1 stick (8 tablespoons) unsalted butter, melted, plus more for greasing

1 1/4 cups all-purpose flour, plus more for dusting the pan

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 mashed banana (from about 2 bananas) 

1/4 cup sour cream

2 large eggs

1 teaspoon pure vanilla extract

2 chocolate-coated vanilla ice cream bars, such as Klondike

Confectioners' sugar, for dusting