Preheat oven to 375 degrees F. Brush 3 large baking sheets generously with some oil.
With a mandoline or other manual slicer cut the potatoes crosswise into 1/8-inch thick slices. Arrange slices in 1 layer on a baking sheet and brush with some remaining oil. Sprinkle potatoes with rosemary, salt and pepper. Repeat these steps for remaining 2 baking sheets.
Bake slices in middle of oven until golden, 15 to 20 minutes. With a metal spatula immediately transfer to a rack to cool completely.
Top potato chips with 1 teaspoon each of caviar and creme fraiche.
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