01 -  In a microwave-safe bowl, melt the butter and chocolate chips in 20-second intervals, stirring until smooth. Stir in vanilla extract. 
 02 -  Lay out the tortillas and spread a thin layer of the chocolate mixture across each one. 
 03 -  Sprinkle with mini marshmallows and graham cracker crumbs. 
 04 -  Roll each tortilla up tightly, then wrap in plastic wrap and chill for 15–20 minutes to firm up. 
 05 -  Unwrap and slice each roll into 2.5 cm (1-inch) pieces to create sushi rounds. 
 06 -  For a toasted finish, lightly spray with cooking spray and broil for 1–2 minutes, or use a kitchen torch on the tops until marshmallows are golden. 
 07 -  Serve as-is or with extra melted chocolate for dipping.