Preheat oven to 300 degrees. Combine popcorn, cereal, pretzels and pecans. In another bowl combine the brown sugar, butter and corn syrup. Cook and stir over medium heat until mixture comes to a boil over entire surface. Reduce heat to medium-low. Cook without stirring 5 minutes. (mixture should continue to bubble gently over surface.) Remove saucepan from heat. Quickly stir in vanilla and baking soda, stirring carefully. Pour over popcorn mixture stirring until well coated. Bake 30 minutes, stirring after 15 minutes. Transfer popcorn mixture to large piece of parchment paper. Cool completely, breaking mixture into clusters as it cools.
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