Spray an 8 x 8-inch square baking pan with nonstick cooking spray.

Set the prepared baking pan aside.

In a large bowl, combine the dry oatmeal, chocolate whey protein powder, finely ground flax seeds, and powdered nonfat dry milk.

Mix the dry ingredients together thoroughly.

In a separate bowl, whisk together the natural-style peanut butter, water, and vanilla extract.

Add the peanut butter mixture to the dry ingredients.

Stir the ingredients together to form a sticky dough.

Stir or knead in the raisins or other dried fruit into the dough.

Using wet hands or a rubber spatula sprayed with cooking spray, spread the mixture evenly into the prepared baking pan.

Freeze the mixture for one hour.

Alternatively, refrigerate the mixture for several hours until firm enough to cut.

Cut the firm mixture into nine equal squares.

Wrap each square individually.

Store the wrapped protein bars in your refrigerator.