Place potatoes, onion, garlic, salt, ground peppercorns, flour, and eggs into a bowl. Fold the mixture together with a rubber spatula, breaking up any large potato chunks, until ingredients are evenly mixed.

Heat oil in a deep-fryer or large skillet to 375 degrees F (190 degrees C).

Form latke dough into 3-inch diameter balls and flatten into 1-inch thick rounds.

Working in batches, place latkes in hot oil and cook until edges are golden brown, 3 to 5 minutes. Flip latkes using a slotted spoon and cook until crisp, 2 to 3 minutes more. Transfer to a paper towel-lined plate to cool.