Add chunks of chuck roast, cinnamon sticks and bay leaves to the bottom of the slow cooker.
Add remaining ingredients to blender (in batches, if necessary) and blitz until smooth. Pour over chuck roast. Secure lid and cook on low for 10 hours.
Once the meat is tender enough to shred with tongs, remove meat from slow cooker. Ladle some of the consommé meat, to keep moist.
In a large wide saute pan over medium-high heat, spray with cooking oil. Add tortilla and layer with cheese, meat, and green onions, then add second tortilla. Spray top with cooking oil. Let cook about 4 minutes then flip and cook another 4 minutes. Repeat with remaining tortillas.
Cut each quesadilla into 6 or 8 pieces and serve with a small dish of the consommé.