Grate potatoes in food processor. Chop onion in food processor.
Using cheesecloth or a ricer, squeeze onions and potatoes to remove as much liquid as you can.
Place potatoes, onions, flour, eggs, salt and baking powder in bowl and stir to mix.
Heat oil in a 6½-quart (6-liter) stockpot on medium high heat.
Using a large cooking spoon, place a generous spoonful of latke mixture in the palm of your hand. Form into a patty, 3 inches in diameter.
Drop patty into hot oil and fry until browned on one side. Flip over and brown other side.
Cook in batches to avoid overcrowding your pot.
You probably will need to add more flour to potato mixture in between batches. The mixture may become watery if the potatoes and onions were not squeezed thoroughly.
Transfer fried latkes to paper towels to drain excess oil. Serve warm with homemade apple sauce and sour cream. Happy Hanukkah!