Grease well a 9x13 pan with butter.
Melt butter in large saucepan over low heat. Add marshmallows and stir until completely melted.
Remove from heat. Stir in cinnamon and vanilla. Add Rice Crispies, cereal and pecans. Stir until well coated.
Press mixture into pan with a sheet of waxed paper or a greased spoon.
Let cool and slice into squares with a greased knife.
Submitted by: Susie Damron