01 - In a mixing bowl, beat the softened cream cheese, granulated sugar, egg yolk, vanilla extract, and lemon zest together until the mixture is completely smooth and creamy with no lumps remaining.
02 - Lay an egg roll wrapper flat on your work surface with one corner pointing toward you. Spoon 1 to 2 tablespoons of the cheesecake filling near the corner closest to you.
03 - Fold the bottom corner up and over the filling, then fold in both sides snugly. Continue rolling tightly away from you. Seal the top corner shut using a small paste made from the flour and water mixed together.
04 - Continue filling, rolling, and sealing the remaining egg roll wrappers until all 12 are assembled and the filling is used up.
05 - Pour vegetable oil into a deep fryer or heavy-bottomed skillet to a depth of about 1 1/2 inches. Heat the oil to 350°F.
06 - Carefully lower the egg rolls into the hot oil in small batches of 3 or 4. Fry for 2 to 3 minutes, turning occasionally, until all sides are an even golden brown.
07 - Using a slotted spoon, transfer the fried egg rolls to a plate lined with paper towels. Allow them to drain and cool slightly for a few minutes.
08 - Dust the warm egg rolls generously with powdered sugar. Serve alongside fresh berries or berry compote, and drizzle with chocolate or caramel sauce if desired.