Chop 1 apple into bite-size pieces.
Combine 2 cups oats, 2 cups soy milk, ¾ cup yogurt, 3 tablespoons peanut butter, 2 tablespoons maple syrup, 1 tablespoon vanilla, ¼ teaspoon salt and ⅛ teaspoon cinnamon in a medium bowl; whisk well. Stir in the chopped apple. Cover and refrigerate until thickened, at least 8 hours.
When ready to serve, transfer the oats into 4 (8-oz.) jars. Top evenly with the remaining 1 tablespoon peanut butter (about ¾ teaspoon each). Finely chop half of the remaining apple and top each jar with about 3 tablespoons each. (Reserve the remaining apple half for another use.)
