01 - Using a hand mixer or whisk, beat the softened cream cheese, granulated sugar, vanilla extract, and sour cream in a medium bowl until completely smooth and creamy, approximately 2–3 minutes. Ensure no lumps remain.
02 - Lay out all tortillas on a clean work surface. Spoon approximately 2 tablespoons of the cheesecake filling onto the lower third of each tortilla. Top with 1 tablespoon of diced berries if desired. Fold both sides inward toward the center, then roll tightly from the bottom upward to form a sealed burrito shape. Secure with toothpicks if necessary to prevent unrolling during frying.
03 - Pour vegetable oil into a deep skillet or heavy saucepan to a depth of 2 inches. Heat over medium-high heat until the temperature reaches 350°F, verified with a kitchen thermometer. Maintain this temperature throughout the frying process for optimal crispness.
04 - Carefully lower 3–4 chimichangas seam-side down into the hot oil. Fry for 2–3 minutes on the first side until golden brown, then flip and fry an additional 2–3 minutes until uniformly crisp and golden. Remove with a slotted spoon and transfer to a paper towel-lined baking sheet to drain excess oil. Repeat in batches until all chimichangas are fried.
05 - While the chimichangas are still warm, brush each generously with the melted unsalted butter using a pastry brush. This ensures the cinnamon sugar adheres properly and adds richness.
06 - Combine the granulated sugar and ground cinnamon in a shallow dish, mixing thoroughly to blend evenly. Roll each buttered chimichanga in the cinnamon sugar mixture, pressing gently to ensure complete coverage on all sides.
07 - Serve the chimichangas immediately while warm for the best texture and flavor experience. Accompany with freshly whipped cream, additional fresh berries, or drizzled chocolate sauce if desired. For an elevated presentation, pair with a sweet dessert wine or black coffee.