What's the Name of That Book??? discussion

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SOLVED: Children's/YA
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SOLVED. Middle Grade. 2017-2018, Blue, Hardcover with cookie (OREO?). Fat protag(MALE?)..? Authors last name starts w/ a letter in the 2nd half of the alphabet. [s]
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I've had this book on my mind for the last couple months, and haven't had any luck searching. I picked it on in my library one day, read a little, and left. This was 2017-2018, Most likely 2018.
I'm pretty sure the cover, which was blue and hardcover, had a cookie on it. Pretty sure it was a black and white cookie, most likely an Oreo. I was convinced that the title of the book was 'Oreo' or something like that, but I could be wrong. [Or it could have had a kid turned away, wearing a backpack?] I'm pretty sure the title was short, most likely one word.
I'm pretty sure the protagonist was a boy(could be wrong), no older than 14. But not younger than 11, either. I vaguely remember the plot, i hope. It was about a kid, who was fat?
One thing I'm pretty sure about is that the authors last name starts with a letter from the last half of the alphabet. It was near(or after?) James Patterson's books, so most likely P or after.
I hope someone can help me find this!