01 - In a mixing bowl, combine the softened cream cheese, granulated sugar, vanilla extract, egg yolk, and salt. Beat with an electric mixer or whisk until the mixture is completely smooth and creamy with no lumps remaining.
02 - Lay one egg roll wrapper flat on a clean work surface. Place approximately 1 1/2 tablespoons of the cheesecake filling in the center of the wrapper.
03 - Fold the bottom corner up and over the filling. Fold both side corners inward toward the center. Continue rolling tightly away from you. Dab a small amount of water along the top corner to seal the edge shut. Repeat with all remaining wrappers and filling.
04 - Pour vegetable oil into a deep pan or heavy-bottomed pot to a depth of 2 inches. Heat over medium-high heat until the oil reaches 350°F. Use a thermometer to monitor the temperature for consistent results.
05 - Carefully lower the egg rolls into the hot oil in small batches of 3 to 4 at a time. Fry for 2 to 3 minutes, turning occasionally, until all sides are uniformly golden brown and crisp. Remove with a slotted spoon and transfer to a plate lined with paper towels to drain excess oil.
06 - Dust the warm egg rolls generously with powdered sugar. Arrange on a serving platter alongside bowls of chocolate sauce or strawberry sauce for dipping. Serve immediately while still warm and crispy.