Line an 8x8 pan with parchment paper and set aside.
In a large saucepan, add the marshmallows and butter. Cook over medium-low heat until completely melted together. Stir in the vanilla, molasses, and spices until well combined.
Immediately add in your cereal and continuously stir until the cereal is completely coated. Pour the mixture into the prepared pan and press down. I like to stick my hand in a Ziplock bag and cover the bag in butter or oil to easily press the cereal mixture down without it sticking to your hands!
Place pan in the fridge to set for about an hour. Slice and enjoy!