Sauté onions and celery in olive oil until softened

Add cooked chicken, tomatoes and beans. Gently simmer for 30 minutes

Boil cauliflower until soft. Mash until smooth. Use a potato ricer if available. Salt to taste. Stir in parmesan cheese.

Evenly layer a 9x9 dish with chicken and vegetable mixture. Fill to about halfway.

Combine egg white into cauliflower mixture.

Evenly layer cauliflower mash, gently patting down to cover bottom layer

Remove from heat. Season to taste with salt and pepper, fresh basil and or sage. Crushed red pepper (optional.)

Bake in a 400° oven for 30 minutes or until bubbly.

Tip with remaining parmesan cheese. Garnish with fresh basil.