Arrange TWIX® on parchment paper–lined baking sheet, about 2 inches apart; set aside.
Melt butter in saucepan set over medium heat; stir in mini marshmallows until melted. Remove from heat; stir in chocolate chips until melted. Stir in vanilla.
Using fork or spoon, drizzle melted marshmallow mixture over each TWIX® to resemble bandages of a mummy.
Press 2 candy eyes onto each mummy. Let stand for 30 to 60 minutes or until cooled and set.