Preheat the oven to 375 degrees F (190 degrees C).

Arrange almonds in a single layer on a baking sheet. Toast in the preheated oven until nuts begin to brown, about 5 minutes.

Combine oil, cranberries, vinegar, water, Dijon mustard, garlic, salt, and black pepper in a blender or the bowl of a food processor; blend until vinaigrette is smooth.

Toss mixed greens, almonds, onion, and blue cheese with vinaigrette in a large bowl until evenly coated.