These bite-size treats are made with a dollop of perfumy jasmine rice set upon a vanilla cookie-crumb base that is coated with chocolate.
Line a 2-inch muffin tin with paper liners. Combine rice, milk, vanilla bean and scrapings, and salt in a medium saucepan; bring to a simmer over medium-low heat. Cook, stirring occasionally, until rice is tender and most but not all of the liquid has been absorbed, 15 to 18 minutes.
Add banana and sugar; cook, stirring constantly, 2 minutes. Stir in egg yolk and 4 tablespoons butter. Transfer to a large bowl; discard vanilla bean. Cover with plastic; refrigerate 2 hours or up to 2 days.
Meanwhile, pulse vanilla wafers in a food processor, and transfer to a small bowl. Add remaining 2 tablespoons butter, and toss well. Press 1 teaspoon mixture into each prepared muffin cup. Pour on chocolate to cover; refrigerate 30 minutes.
Remove cookie-crumb crusts from liners, and place on serving plates. Top each with 1 tablespoon pudding, and serve.