In a mixing bowl, combine the softened cream cheese, granulated sugar, vanilla extract, lemon juice, and ground cinnamon. Blend until smooth and creamy.
Lay a large flour tortilla flat, spoon about 1/4 cup of the cheesecake filling into the center, sprinkle chocolate chips if desired, fold in the sides, and roll tightly.
Heat about 1 inch of oil in a skillet over medium heat. Fry the chimichangas seam-side down for 2-3 minutes on each side until golden brown and crispy.
Dust the fried chimichangas lightly with powdered sugar and serve warm.