Pour the cereal into a very large bowl.
Pour buttermilk over the cereal and mix with a spoon.
Stir the cereal to break up the flakes.
With a large spoon, stir in all of the remaining ingredients. Let sit for 20 minutes and then stir again.
Spray muffin tins with baking spray.
Fill the tins ¾ of the way full.
Bake at 375 for 14 minutes (mini-muffin size) or 16 minutes (regular muffin size) or (18-20 minutes Jumbo size).