Gather all ingredients.

Whisk water and eggs together in a small bowl. Mix bread crumbs and garlic salt together in a medium bowl. Blend flour and cornstarch together in a third bowl. Heat oil in a deep fryer or large, heavy saucepan to 365 degrees F (185 degrees C).

Dredge a mozzarella stick in the flour mixture; shake off excess. Dip into the egg mixture, allowing excess to drip off. Press into the bread crumbs to coat. Repeat dipping in the egg and bread crumbs to create a double coating. Place breaded mozzarella sticks on a parchment-lined baking sheet.

Freeze until firm, about 45 minutes, to help the coating set and prevent cheese from oozing during frying.

Working in batches, carefully lower 3 to 4 frozen mozzarella sticks into the hot oil using a spider spoon or tongs. Fry until golden brown, about 1 to 2 minutes, turning occasionally for even color. Avoid overcrowding the pan to maintain oil temperature.

Remove fried sticks with tongs and drain on paper towels. Repeat with remaining mozzarella sticks.

Serve hot and enjoy!