1. Heat oil in large nonstick skillet on medium heat. Add shallots and garlic; cook and stir 3 minutes or until tender. Add curry powder; cook and stir 30 seconds or until fragrant. Add mushrooms; cook and stir 5 minutes or until tender. Add tomato; cook and stir 1 minute. Transfer mushroom mixture to bowl. Wipe skillet clean.
2. To assemble quesadillas, place 2 tortillas on work surface. Divide mushroom mixture, cheese slices and spinach evenly between tortillas. Top with remaining tortillas.
3. Brush skillet with oil. Heat on medium heat. Cook 1 quesadilla at a time for 2 to 3 minutes per side or until cheese is melted and tortilla is lightly browned. Cut each into 6 wedges. Serve with yogurt or sour cream.
*Recipe and Photo Courtesy of McCormick & Company, Inc.