Prepare the ingredients as listed.
Place the cucumber slices in a pitcher with the water and refrigerate to infuse. Serve over ice.
Preheat the oven to 350°F (177°C) and line a baking sheet with parchment paper.
Heat the olive oil in a medium pot over medium heat. Add the onion, carrots, celery, and garlic and sauté until softened. Season with salt and black pepper to taste.
Add the chicken, chicken broth, wild rice, thyme sprig, bay leaf, and sage. Bring to a simmer, partially cover, and cook until the rice is tender and the soup is flavorful.
Mash the banana in a bowl until smooth. Stir in the vanilla extract and cinnamon, then fold in the oats until evenly coated. Gently mix in the dark chocolate chips. Scoop onto a lined baking sheet and bake until set and lightly golden, about 12 minutes.
Remove the thyme sprig and bay leaf. Stir in the green peas and adjust seasoning with salt and black pepper to taste.
In a bowl, combine the arugula, cannellini beans, olive oil, and lemon juice. Toss gently and season with salt and black pepper to taste.
Toast the bread if desired and spread with butter.
Serve the chicken and vegetable soup with bread and butter, arugula white bean salad, cucumber water, and banana oatmeal cookies.