Start the soup: Spray slow cooker with nonstick spray (optional). Add chicken, olive oil, celery, carrot, garlic, onion, broth, rice, rosemary, thyme, and bay leaves. Cover and cook on high 3–4 hours or low 6–8 hours
Bake cookies: Preheat the oven to 350°F (175°C). Line a baking sheet with parchment.
In a medium bowl, whisk flour, baking soda, and salt.
In another bowl, whisk butter, granulated sugar, and brown sugar until creamy. Whisk in vanilla and egg. Stir in flour mixture just until combined. Fold in chocolate chips.
Drop dough by spoonful onto a baking sheet. Bake for 10–15 minutes (10–12 minutes for chewy, 15 minutes for crisp). Cool for 5 minutes.
Shred chicken: Discard bay leaves from soup. Remove chicken, shred with forks, and return to the slow cooker.
Make white sauce: In a small saucepan, melt butter over medium heat. Stir in flour and cook for 1–2 minutes, stirring constantly. Slowly whisk in cream until thick and smooth. Stir into soup. Add lemon juice, adjust seasoning with salt and pepper. Keep warm.
Make banana milk: In a blender, combine banana, maple syrup, vanilla, milk, water, and ice cubes. Blend until smooth. Adjust sweetness or consistency as desired.
Serve the soup with bread and buter, korean banana milk, and cookies.