Park Slope parents may swear by Montessori toys and organic snacks — but come Halloween, it’s all plastic fangs and candy corn on the Brooklyn neighborhood’s tree-lined streets.

And in this storybook version of spooky suburbia, where every stoop tells a tale and every shriek of laughter echoes off the brownstones, there’s one particularly haunted block locals are ready to crown the most fun — 11th St. between Prospect Park West and 8th Avenue.

As early as 3 o’clock in the afternoon on the scariest night of the year, the first wave of trick-or-treaters could be seen flocking to the strip’s selection of show-stopping displays.

The vibes at 606 11th St. were pure Halloween harmony — guitarists Camp Childers and Mike Coon dueled over spooky movie riffs on the steps as kids gawked, grooved,

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