Heat olive oil in a large skillet over medium heat and cook bacon until crisp and brown, turning often, about 10 minutes. Remove bacon and drain on paper towels; crumble when cool. Set bacon aside.
Cook and stir onion in the same skillet until translucent, about 5 minutes. Stir in chicken, sausage, garlic, thyme, bay leaves, and black pepper; cook until chicken pieces are browned, 5 to 8 minutes. Stir in tomato paste.
Transfer chicken mixture to a slow cooker and stir in crumbled turkey bacon, great Northern beans, and diced tomatoes. Cover the cooker, set on Low, and cook until cassoulet is thickened and the chicken is very tender, 4 to 5 hours. Sprinkle with parsley before serving.
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