Preheat oven; cook maple syrup, butter, vinegar, and spices: Preheat oven to 275°F. Combine maple syrup, butter, vinegar, thyme, cayenne, and 1 teaspoon salt in a saucepan. Bring to a boil, stirring, until butter has melted and mixture is combined. Remove from heat.
Combine remaining ingredients: Stir together remaining ingredients in a large bowl.
Drizzle maple mixture over and stir to coat: Drizzle maple mixture over cereal mixture, stirring to evenly coat.
Bake: Spread on a rimmed baking sheet. Bake, stirring a few times, until crisp and golden, about 1 hour. Let cool completely before serving.
