Caramel Chex Mix

1/2 cup butter

1/2 cup light Karo syrup

1 cup brown sugar, packed

1 tsp vanilla

1/2 tsp baking soda

4 cups Rice Chex Cereal

4 cups Corn Chex cereal

1 cup peanuts

1 cup plain M&Ms

Mix cereal and peanuts in a large bowl, set aside.  Preheat oven to 250 degrees.  Spray cookie sheet with Pam.  In medium saucepan, combine butter, karo syrup and brown sugar.  Bring to boil over medium heat, stirring constantly.  Allow to boil for 5 minutes without stirring.  Take off heat and add vanilla and baking soda, mix well.  Pour over cereal mixture and mix together.  Then pour onto cookie sheet and bake in oven for one hour, stirring every 15 minutes.  Remove from oven, break apart clumps and let mix cool.  When completely cool, add M&Ms. - Tricia