Preheat oven to 350 degrees. Lightly spray a 9x13-inch baking dish with nonstick cooking spray.
Combine all ingredients in a large bowl. (The batter will be rather thick.) Spread the batter in the prepared dish.
Bake for 20 to 30 minutes. (The batter should still be shaky and might appear not completely cooked, but this recipe yields a gooey cookie bar. If you prefer a more firm cookie, cook 10 minutes more.)
* If nutritional values are provided, they are an estimate and will vary depending on the brands used. The values do not include optional ingredients or when ingredients are added to taste.
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