In a bowl, mix together the flour, salt, pepper, and paprika.
Toss the sliced onions in the flour mixture until well coated.
Heat vegetable oil in a deep pan or fryer to 350°F (180°C).
Fry the coated onions in batches until golden brown and crispy, about 3-4 minutes per batch.
Remove the fried onions with a slotted spoon and place them on a paper towel-lined plate to drain excess oil.
Serve the crispy homemade French fried onions as a topping for salads, burgers, or casseroles.
Notes:
Ensure the oil is hot enough before frying to achieve the perfect crispiness. You can also add other seasonings to the flour mixture for a different flavor.