The twisted teenager who allegedly beheaded his mom’s boyfriend in Staten Island scooped the victim’s brains out with a spoon and put them in a blender, police sources said.

It wasn’t clear what Damien Hurstel intended to do with the gray matter, which was found in the kitchen appliance at the scene, the sources said.

Cops said the 19-year-old confessed to stabbing his mother’s live-in boyfriend , Anthony Casalaspro and sawing off his head inside the family’s Cary Avenue home in West Brighton on Oct. 6. 8

The 45-year-old victim’s remains were found with a plastic soup ladle on the torso, and his head beside him with a spoon sticking out, a photo obtained by The Post showed.

Hurstel, who is facing second-degree murder, manslaughter and weapons charges, was transferred from a

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