Preheat the oven to 425 degrees F.
Place the water, butter, sugar, and salt in a saucepan. Place over medium-high heat, until the butter is completely melted and the mixture is simmering.
Add in the flour all at once, and continue to cook, stirring, for about 5 minutes, or until a film begins to form on the bottom of the pot.
Transfer the mixture to a mixing bowl, and beat on medium speed.
Drop in the eggs, one at a time. Allow each egg to become fully incorporated, before adding the next (about 30 seconds to a minute).
Fold in the crushed cookies.
Pipe the dough onto parchment-lined baking sheets, allowing about 3 inches in between each churro.
Bake for 15-20 minutes, depending on size. Remove from the oven when they are puffed, golden brown, hollow, dry, and light.