1. Line a 9×9 pan with aluminum foil and coat lightly with nonstick spray.
2. In a large saucepan over medium-low heat melt butter. Once it’s melted continue to cook the butter until it boils and begins to brown, stirring constantly. Once the butter is an amber color add 8 cups of the marshmallows and stir constantly until melted. Remove from the heat and stir in the vanilla, salt and cinnamon. Immediately stir in the cereal until coated evenly in the marshmallow mixture.
3. Stir in the remaining 2 cups of mini marshmallows.
4. Pour the mixture into the prepared pan and press evenly. Sprinkle with topping.

Topping

1. Mix together the sugar and cinnamon and sprinkle onto the krispie treats evenly.
2. Cool completely and cut into bars.