Cream together butter and sugars. Beat in egg, vanilla and water until smooth.
Add oat bran, oat flakes, flour, baking soda, salt and chocolate chips and stir until all ingredients are thoroughly combined.
This dough will spread when baking. To avoid this, cover and place dough in refrigerator for about 2 hours to create a stiff dough.
Preheat oven to 300°.
Take a tablespoon of dough and shape into a ball, place on parchment lined cookie sheet, leaving a 2” space. Leave balls in fridge until ready to bake.
Bake for 18 to 22 minutes. Cool cookies 2-5 minutes on sheet, remove and cool completely on wire rack.
NOTE: Refrigerating dough, using parchment paper and a cool oven help to reduce the spread on this cookie.