Prepare the Crumbing Station:
Arrange crushed Doritos, flour, and breadcrumbs in three separate shallow dishes.
In a fourth dish, beat the eggs until well combined.

Coat the Mozzarella Sticks:
Dredge each mozzarella stick in flour, shaking off any excess.
Dip into the beaten eggs, then roll in crushed Doritos to coat evenly.
For a thicker, crunchier crust, repeat the egg and Doritos coating process once more.

Freeze for Stability:
Place coated mozzarella sticks on a plate or tray and freeze for at least 30 minutes. This step helps prevent cheese leakage while frying.

Heat the Frying Oil:
Pour vegetable oil into a deep fryer or large heavy-bottomed saucepan to a depth of at least 2 inches.
Heat the oil to 375°F (190°C), checking with a kitchen thermometer for accuracy.

Fry the Cheese Sticks:
Working in batches, carefully fry the mozzarella sticks for 1–2 minutes per side, or until golden brown and crisp.
Avoid overcrowding to maintain oil temperature.

Drain Excess Oil:
Use a slotted spoon to remove fried sticks and place them on a plate lined with paper towels to absorb any excess oil.

Serve Fresh:
Enjoy immediately while hot and melty. Serve with your favorite dipping sauces like marinara, ranch, or spicy aioli.