01 -
Lightly grease a 9x13-inch non-stick pan with butter or nonstick spray to ensure easy removal.
02 -
In a large, heavy-bottomed nonstick pot over medium-low heat, melt the butter. Add marshmallows and stir constantly with a silicone spatula until fully melted and smooth. Remove from heat promptly to avoid overcooking.
03 -
Immediately add the Rice Krispies to the melted marshmallow mixture. Fold together using a buttered spatula or greased hands until evenly coated. Work quickly, as the mixture sets fast.
04 -
Transfer the mixture to the prepared pan and gently press down evenly to form a flat surface without compacting too much.
05 -
Allow the mixture to cool at room temperature for about 20 minutes, then cut into rectangles or squares using a sharp, greased knife.
06 -
Melt white chocolate chips with coconut oil (if using) in the microwave in 20-second intervals, stirring after each, until smooth. Transfer melted chocolate to a piping bag or resealable plastic bag with a small tip snipped off.
07 -
Drizzle melted white chocolate in a crisscross pattern over each piece to simulate mummy bandages. While chocolate is still soft, place two candy eyeballs on each mummy.
08 -
Let decorated treats sit until the white chocolate firms; refrigerate for a few minutes if needed. Serve on a Halloween-themed platter.