The Evil Chef

Il Cuoco Malvagio (The Evil Chef) is an Italian children's book by Cristina Brambilla in the "Misteri A 4 Zampe" series.

Premise
Mystery Inc. is at the Milion Hotel, where the city's best chefs will compete in rounds of sandwiches, cakes and souffles. But suddenly a monster emerges from the kitchen, pounces on the prize (a spoon encrusted with precious stones), and takes it away. A new case to solve for Scooby and his friends.