Slow Cooker Salsa Verde Chicken Tacos

lbs. chicken breasts, boneless, skinless

jar of salsa verde {about 2 cups}

green pepper, chopped

can of diced chilies

jalapeño, seeds removed, chopped {optional for spice}

Tortillas or hard shell tacos for the tacos

Garnish ideas: fresh cilantro, cheese, tomatoes, extra salsa