### Instructions
1. **Prepare the Filling:** Heat olive oil in a large skillet over medium-high heat. Add ground beef and onion, breaking up the beef with a spoon. Cook until the beef is browned and the onion is softened, about 5-7 minutes. Drain any excess grease.
2. **Season and Flavor:** Stir in minced garlic and cook for another minute until fragrant. Add Worcestershire sauce, salt, pepper, ketchup, and mustard. Mix well and cook for 2-3 minutes, allowing the flavors to meld.
3. **Add Cheese and Pickles:** Remove the skillet from heat. Stir in both shredded cheeses and chopped pickles (if using) until the cheese is melted and evenly distributed.
4. **Assemble the Egg Rolls:** Lay an egg roll wrapper on a clean, flat surface with one corner pointing towards you (forming a diamond shape). Place about 2-3 tablespoons of the cheeseburger filling in the center of the wrapper, just below the center point.
5. **Fold and Roll:** Fold the bottom corner up over the filling. Fold in the left and right corners towards the center. Roll the egg roll tightly from the bottom towards the top corner. Before reaching the top, moisten the top corner with a little water to seal. Finish rolling to secure. Repeat with remaining wrappers and filling.
6. **Fry the Egg Rolls:** Heat about 2-3 inches of vegetable oil in a large, deep skillet or Dutch oven to 350°F (175°C).
7. **Cook Until Golden:** Carefully place 3-4 egg rolls into the hot oil, being careful not to overcrowd the pan. Fry for 3-5 minutes, turning occasionally, until golden brown and crispy on all sides.
8. **Drain and Serve:** Remove egg rolls with a slotted spoon and place them on a plate lined with paper towels to drain excess oil.
9. **Enjoy!** Serve hot with your favorite dipping sauces.
### Short Tips
* **Don’t Overfill:** Too much filling can make the egg rolls difficult to roll and may cause them to burst during frying.
* **Seal Tightly:** A good seal is crucial to prevent the filling from escaping during frying.
* **Monitor Oil Temperature:** Use a kitchen thermometer to ensure the oil stays at the correct temperature for even cooking and a crispy exterior.
* **Make Ahead:** You can assemble the egg rolls ahead of time and store them in the refrigerator, covered, for up to 24 hours before frying.
* **Air Fryer Option:** For a healthier alternative, air fry the egg rolls at 375°F (190°C) for 10-15 minutes, flipping halfway through, until golden and crispy. Lightly spray with oil before air frying for best results.
