Preheat oven to 400 degrees F. Line a baking sheet with parchment paper.
Heat olive oil in a medium skillet over medium high heat. Add ground beef and cook until browned, about 3-5 minutes, making sure to crumble the beef as it cooks. Drain excess fat and stir in taco seasoning and green chiles; set aside.
Top tortilla with refried beans, ground beef mixture, avocado and mozzarella, and then top with another tortilla. Repeat with remaining tortillas to make 4 quesadillas.
Place quesadillas onto the prepared baking sheet. Place into oven and bake until the cheese has melted, about 8-10 minutes.
Serve immediately, garnished with cilantro, if desired.