Waffled Banana Bread

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1 1/4 cups all-purpose flour

3/4 cup sugar

1/2 cup chopped walnuts

1 teaspoon baking powder

1/2 teaspoon baking soda

1/2 teaspoon ground cinnamon

1/2 teaspoon freshly grated nutmeg

1/4 teaspoon fine salt

1 cup smashed banana (2 to 3 small bananas)

1/2 cup vegetable oil, plus more for brushing waffle iron

1/2 cup sour cream or Greek yogurt

1 teaspoon pure vanilla extract

2 large eggs

Soft unsalted butter and confectioners' sugar, for dusting, optional