In microwave safe bowl, melt almond bark at 30 second intervals until melted. In a large bowl, add cereal, pretzels, and M&Ms. Pour melted almond bark over the cereal mixture. Use a large spatula to fold all together making sure not to break up the cereal too much. Once all the mixture is coated, pour onto a surface lined with waxed paper. Once cooled, break up into pieces.