Maui Banana Cream Tube Cake

INGREDIENTS

• 1/3 cup butter
• 1 1/4 cups white sugar
• 2 eggs
• 2 teaspoons vanilla extract
• 1 1/4 cups mashed ripe bananas
• 2 cups all-purpose flour
• 1 1/4 teaspoons baking powder
• 1 teaspoon baking soda
• 1/2 teaspoon salt
• 1 cup nonfat plain yogurt
• 3/4 cup chopped pecans
• 2 tablespoons confectioners' sugar, or to taste