In the bowl of a food processor, pulse together granola and flour until granola is broken into small pieces. Pour into a shallow bowl.
In a mixing bowl, whisk together milk, eggs, maple syrup, vanilla, and salt.
Preheat a griddle or frying pan over medium. Spray with canola spray oil.
Dip slices of bread into egg mixture, turning to coat. Let excess drip off bread, then place bread into granola, pressing to stick. Carefully move bread onto griddle (at this point you may need to re-stick some granola to the top side) and cook for about 4 minutes per side. Repeat with remaining slices of bread.