Layered Tortilla Casserole

• 6 corn tortillas nonfat
• 1 clove garlic (minced)
• 260 gr kidney beans
• 260 gr great northern beans (drained)
• 240 ml tomato sauce
• 150 gr corn kernels
• 120 gr nonfat cottage cheese
• 120 gr onion (chopped)
• 100 gr celery (chopped)
• 60 ml water