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Preheat oven to 350F. Line a baking sheet with aluminum foil. Spray with cooking spray and set aside.
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Prep: Place cereal in a very large bowl. Set aside.
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Combine sugar and cinnamon in a small bowl. Set aside.
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Cook: In a large pot, heat brown sugar, butter, salt, and corn syrup. Stir until butter is melted and sugar is mostly dissolved. Bring to a boil. Let boil for 1 minute, stirring constantly. Remove from heat and stir in baking soda.
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Pour mixture over cereal, and stir until cereal is completely coated. Turn out onto prepared baking sheet. Spread into an even layer. Sprinkle with cinnamon-sugar, enough to coat. Put the extra aside.
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Bake for 5 minutes. Flip and spread out. Sprinkle with remaining cinnamon-sugar and bake for another 3 minutes. Chex Mix will be starting to turn golden brown.
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Remove from oven and allow to cool completely. Break into pieces.
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Store in an airtight container.