Preheat oven to 350°F. Line an 8x8-inch baking pan with aluminum foil and lightly spray with nonstick spray.
In a large sauce pan, melt the butter, honey, brown sugar, vanilla, salt and cinnamon. Let boil for one minute until sugar is dissolved.
Add Honey Bunches of Oats® cereal. Gently stir until cereal is completely coated.
Pour into pan and press into even layer. Bake for 15-20 minutes. Cool for 5 minutes, then crumble into chunks.