In a large bowl combine cereals, pretzels, and peanuts.
In a small microwave safe bowl, combine maple syrup and butter. Cover and microwave on high for 45 seconds or until butter is melted. Stir in extract. Pour over cereal mixture and toss to coat. Transfer to two 15 x 10 x 1 inch baking pans, coated with cooking spray.
Bake at 250º for 45 minutes, stirring every 15 minutes. Remove from oven; cool.