1. Preheat oven to 350. In a small bowl, mix the oat bran, oats, maple syrup, salt, and water. Press the mixture evenly into an oiled 9x13 inch baking sheet. Press the mixture into the baking pan (plastic wrap help with this). Bake 10 minutes, set aside.
2. In a medium bowl, combine all the topping ingredients. Pulse the mixture in a food processor a few times until sticky. Place the topping over the oat crust; using another sheet of plastic wrap, cover the topping and press down. Remove plastic and bake for 20 to 25 minutes. Cut while warm. These are best served at room temperature or warm.