White Chocolate and Maple Rice Krispie Squares

"This is a yummy variation on the classic kids' treat. I like my rice krispie squares to be heavy on the mallow so if you prefer, feel free to add more rice krispies to the mix! I don't have easy access to good maple syrup this side of the pond so please feel free to adjust that amount too- 2 tablespoons of the fake stuff I get here is about right but you may need less of the real thing! If you want to make less, half of this recipe fits in a loaf tin beautifully...."