1Blend milk, beans, brown sugar, egg, coffee, cocoa powder, cornstarch, chili powder, and garam masala together in a blender until smooth.
2Pour bean mixture into a saucepan over medium heat; cook, stirring constantly, until mixture thickens, 10 to 15 minutes. Remove from heat and stir in butter and vanilla extract until shiny and smooth. Pour into dessert bowls.