Add the raw chicken breast to the cooker. Season with salt and pepper.
Add the tomatoes, beans, stock, water, veggies, basil, oregano, salt, and pepper.
Cover and cook on low for 5 hours.
Remove the cooked chicken breast from the pot and shred.
Return the shredded chicken to the pot along with the pepperoni.
Stir well and heat through.
Serve hot along with grated Parmesan cheese for garnish.