Sticky Toffee Mini Bundt Cakes

Name: Sticky Toffee Mini Bundt Cakes
Ingredients: 1 1/2 cups pitted dates, chopped; 1 yellow banana; 1 1/2 sticks butter, melted and cooled slightly; 1 cup light brown sugar; 2 tablespoons brandy; 1 teaspoon vanilla extract; 1/2 teaspoon salt; 1 large egg, beaten; 1 2/3 cups all-purpose flour, plus more for dusting the pan; 1 teaspoon baking powder; 1 teaspoon baking soda; Nonstick cooking spray; Granulated sugar, for dusting the pan; One 5-ounce can evaporated milk; 1/2 cup light brown sugar; 1/2 cup powdered sugar; 1/3 teaspoon salt; Ice water, as needed; 2 tablespoons butter