Preheat the oven to 250 degrees F (120 degrees C). Lightly grease a large roasting pan.
Mix cereal, pecans, and almonds together in a large bowl.
Mix brown sugar, butter, and corn syrup in a saucepan and bring to a boil. Boil 2 minutes, stirring constantly. Pour over cereal and nuts and mix until well coated. Transfer to the prepared roasting pan.
Cook in the preheated oven for 1 hour, stirring every 15 minutes.
Remove from the oven and spoon onto waxed paper to cool. Store in airtight containers.
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