Place all of the cereals, pretzels and crackers into slow cooker.

In a small microwave safe bowl, melt butter.

Add brown sugar, Worcestershire, seasoning salt, cinnamon and cayenne to butter. Mix well.

Pour butter mixture over cereal mixture and stir to coat.

Cover with lid and set slow cooker on low for 2 1/2-3 hours, stirring every 30 mins. (Make sure to stir down to the bottom to make sure it doesn't burn)

NOTE: to prevent condensation from dripping onto cereal, you can place a clean dishcloth between the lid and slowcooker base.

Once done, spread out on wax paper to cool.

Add M&M's and store in air tight container.