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, then fold in both side corners toward the center. Roll tightly upward, sealing the top edge with a light brush of water. 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.
05 - 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 crispy. Remove with a slotted spoon and transfer to a paper towel-lined plate to drain excess oil.
06 - Dust the warm egg rolls generously with powdered sugar. Serve immediately with chocolate sauce or strawberry sauce on the side for dipping.