01 -  Lightly grease a 9x13-inch baking pan or line the pan with parchment paper for easy removal. 
 02 -  In a large saucepan over medium-low heat, melt unsalted butter. Add mini marshmallows and stir continuously until melted and smooth. Remove from heat and incorporate vanilla extract. 
 03 -  Quickly fold in the multigrain or crispy rice cereal. Stir until the cereal is evenly coated by the marshmallow mixture. 
 04 -  Gently mix in half of the candy-coated chocolates and half of the mini chocolate chips for even distribution. 
 05 -  Transfer the prepared mixture to the greased or lined pan. Press the mixture firmly into an even layer using a buttered spatula or wax paper. 
 06 -  Sprinkle the remaining candy-coated chocolates, mini chocolate chips, and candy eyes evenly over the surface. Press toppings in gently to set. 
 07 -  Let the bars cool completely at room temperature for approximately 30 minutes. Once set, slice into 12 equal bars.