Preheat oven to 375 F. In large mixing bowl, beat butter and peanut butter with electric mixer on medium to high speed for 30 seconds. Add sugar, baking soda and salt. Beat until combined, scraping sides of bowl. Beat in water, egg and vanilla until combined. Beat in flour until combined. Beat in as much of he rolled oats as you can with the mixer. Stir in any remaining rolled oats. Stir in Cheerios.
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