At Home: Preheat oven to 325. In a mixing bowl, add all the ingredients except the powdered milk and stir to thoroughly combine. Spread the mixture on a lined baking sheet. You'll want the oat mixture to be fairly compact so it has a chance to form clumps - we only used about 1/3 of a standard baking sheet. Bake for 20-25 minutes, turning the pan around (but not stirring the granola) halfway through so it cooks evenly. Once the granola is golden brown, remove from the oven and allow it to cool completely. Break the granola into small clumps.
Split the granola between two resealable bags and add 1 tablespoon powdered milk to each.
At Camp: Add water (about 1/3 cup or 3 oz), stir to combine with the powdered milk. Enjoy!