Grease a 9x9 inch square baking pan or line with parchment paper.

In a large saucepan, melt the butter over low heat.

Add the mini marshmallows to the saucepan and stir continuously until fully melted and smooth.

Stir in the dry instant banana pudding mix and vanilla extract until the powder is fully incorporated and the mixture is uniform.

Remove the saucepan from the heat and add the puffed rice cereal, stirring until every grain is evenly coated with the marshmallow mixture.

Gently fold in the crushed vanilla wafers and dried banana chips until distributed throughout the mass.

Transfer the mixture to the prepared baking pan and press down evenly using a greased spatula, ensuring not to over-compress the cereal.

Allow the treats to cool and set at room temperature for approximately 30 minutes before slicing into 12 uniform bars.