Banana Bread Truffles

Name: Banana Bread Truffles
Ingredients: Nonstick cooking spray, for the pan; 8 tablespoons (1 stick) unsalted butter, at room temperature; 1 cup sugar; 2 large eggs; 3 ripe bananas (about 1 pound); 2 cups all-purpose flour (see Cook's Note); 1 tablespoon whole milk; 1 teaspoon baking powder; 1 teaspoon baking soda; 1 teaspoon ground cinnamon; 1 teaspoon kosher salt; 1 cup vanilla frosting; 1 pound semisweet chocolate chips; 1/4 cup vegetable oil; Chopped walnuts, chocolate sprinkles, flaky sea salt, cocoa powder and caramel sauce, for topping