Warm White Bean & Tuna Quesadillas

INGREDIENTS

• 1 can (16 oz.) cannellini beans, rinsed and drained
• 2 cans (5 oz. ea.) tuna in water, drained
• 1/4 cup Hellmann's® or Best Foods® Real Mayonnaise
• 2 tsp. lemon juice
• 1/4 tsp. salt
• 4 (8-in.) fajita size flour tortillas
• 4 slices part-skim mozzarella cheese or provolone cheese
• 1 cup baby spinach leaves or frozen spinach, thawed and squeezed dry