Bring a pan of lightly salted water to a boil. Place cauliflower in boiling water and cook until tender, 5 to 8 minutes. Remove from heat, drain, and cool.

Heat oil in a deep-fryer to 365 degrees F (180 degrees C).

Whisk together egg and milk in a small bowl. Place cracker crumbs in a shallow dish. Dip cauliflower in the egg mixture then roll in cracker crumbs.

Fry coated cauliflower in the hot oil until golden brown. Drain on paper towels.