Position the racks at the top and bottom third of the oven and preheat to 350 degrees Fahrenheit
Stir the oil, honey, and vanilla in a small saucepan over medium-low heat until the honey dissolves. Continue heating, stirring a few times, just until a few whiffs of steam come off the top. Set aside off the heat.
Mix the grains, almonds, dry milk, brown sugar, wheat germ, cinnamon, and salt in a big bowl. Pour in the oil mixture. Stir until everything is moist. Spread the mixture into even layers on two large rimmed baking sheets.
Bake until crunchy, about 20 minutes, stirring once halfway through baking. Cool on the sheets set on a rack for at least 1 hour and it hardens. Break the granola into bits, chips, and flakes for storage.