In a mixing bowl, cream together the butter and sugars. Then stir in the egg, water, and vanilla extract.
In another mixing bowl, stir together the flour, baking soda, salt, and quick oats.
Combine the wet and dry ingredients and stir until a dough ball forms.
Spoon the batter onto a baking sheet lined with parchment paper or a baking mat. Bake at 350°F for 11-12 minutes until the edges turn a deep golden brown and the centers look soft.
Notes
Lisa's original recipe calls for shortening instead of butter. I bake more often with butter, so that's what I use (and it works well here), but you can use either if you already have shortening on hand. I have baked the dough just after mixing, and I've also baked it after letting the dough chill in the refrigerator for an hour. Both work well and didn't affect the bake time. I have yet to bake these from frozen dough, that might require another minute or two of bake time. If you try it, let us know in the comments how it goes.