Tuscan Style Spinach and White Bean Soup

Ingredients 1 tablespoon olive oil 1 onion, medium diced 1 stalk celery, medium diced 1 clove garlic, minced 2 (16 ounce) cans cannellini beans, rinsed and drained 3 ½  cups chicken stock 1/4 teaspoon ground black pepper 1/4 teaspoon dried thyme or 1 teaspoon fresh thyme 1 bunch fresh spinach, rinsed and thinly sliced 1…