Line an 8x8 or 9x9-inch baking pan with parchment paper, leaving an overhang. Lightly spray with non-stick spray. Place the 6 cups of cereal into a very large mixing bowl.

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

Once melted, whisk in the molasses, ginger, cinnamon, nutmeg, cloves, vanilla, and salt until smooth.

Add the 10 oz bag of mini marshmallows. Stir constantly over low heat until 90% melted. Remove from heat immediately.

Pour the spiced marshmallow mixture over the cereal. Add the reserved 1 cup of mini marshmallows. Gently fold with a greased spatula until all cereal is coated.

Transfer mixture to the prepared pan. Using greased hands or a spatula, very gently press the mixture into an even layer. Do not pack it down tightly! Let set for 30 minutes at room temp.

Whisk together the powdered sugar, cream, and vanilla until smooth and spreadable. Spread evenly over the set treats.

Let icing set for 15 minutes, dust with powdered sugar, lift out of the pan using the parchment, and cut into squares.