In a medium bowl, stir together the maple syrup, 1/4 cup peanut butter, water, and vanilla, until smooth.
Stir in the oats and salt. Transfer approximately 2/3 of the mixture into a parchment lined 8 x 8 pan (or 9 x 4 loaf pan if you want them really thick!)
Use a small sheet of parchment paper to press it down evenly into the pan.
In a pot or double broiler on the stove (or bowl and microwave) carefully melt the chocolate chips and remaining 1/3 cup peanut butter, stirring until smooth. Pour this evenly on top of the oatmeal mixture in the pan.
Sprinkle the remaining oat crumbles on top of the chocolate layer and freeze until firm enough to cut into squares. Keep in the fridge for a week, or freezer longer!