In a large bowl, combine cereal and trail mix.
In a large saucepan over medium heat, combine brown sugar, honey, and butter.
Stirring frequently, bring the mixture to a boil, and boil for 2 minutes.
Remove from heat, and pour the honey mixture over the cereal mixture.
Stir to combine, and press into the bottom of a lightly greased 8x11-inch pan.
Allow bars to set in refrigerator for 2 hours.
Cut into 12 squares, and enjoy!