01 - In a mixing bowl, beat the softened cream cheese, granulated sugar, egg yolk, vanilla extract, and lemon zest until the mixture is smooth and creamy with no lumps remaining.
02 - Lay an egg roll wrapper flat on a clean work surface with one corner pointing toward you. Place 1 to 2 tablespoons of the cheesecake filling near the corner closest to you.
03 - Fold the bottom corner up and over the filling, tuck in the left and right sides, then continue rolling tightly away from you. Seal the top edge with a thin paste made by mixing the flour and water together.
04 - Continue filling, rolling, and sealing the remaining wrappers until all 12 egg rolls are assembled.
05 - Pour vegetable oil into a deep fryer or heavy-bottomed skillet to a depth of about 1½ inches. Heat the oil to 350°F.
06 - Carefully lower the egg rolls into the hot oil in small batches of 3 to 4. Fry for 2 to 3 minutes, turning occasionally, until all sides are evenly golden brown and crisp.
07 - Using a slotted spoon, transfer the fried egg rolls to a plate lined with paper towels to drain off any excess oil.
08 - Dust the warm egg rolls generously with powdered sugar and serve alongside fresh berries or drizzle with chocolate or caramel sauce as desired.