Preparation

• Heat oven to 350°F.
• Core tomatoes, then cut into 1/4-inch-thick slices. Place on paper towels; let stand 10 min. to drain. Meanwhile, combine onions and mustard.
• Place 13 crackers in single layer on bottom of 9-inch pie plate sprayed with cooking spray.
• Reserve 2 Tbsp. cheese for later use. Sprinkle half of the remaining cheese over crackers in pie plate. Stand 16 of the remaining crackers, with edges slightly overlapping, around edge of pie plate.
• Layer half EACH of the onion mixture and tomatoes over crackers on bottom of pie plate; top with layers of remaining crackers, cheese, onion mixture and tomatoes. Sprinkle with reserved cheese. Cover loosely with foil.
• Bake 20 to 25 min. or until hot and bubbly. Sprinkle with thyme leaves.