1 tablespoon olive oil
1 (12.8-ounce) package smoked andouille sausage, thinly sliced
3 cloves garlic, minced
1 onion, diced
3 carrots, peeled and diced
2 stalks celery, diced
2 (15-ounce) cans Great Northern beans, drained and rinsed
1/2 teaspoon dried oregano
2 bay leaves
4 cups chicken broth
Kosher salt and freshly ground black pepper, to taste
3 cups baby spinach
Heat olive oil in a large skillet over medium high heat. Add sausage, and cook, stirring frequently, until lightly browned, about 3-4 minutes.
Place sausage, garlic, onion, carrots, celery, beans, oregano and bay leaves into a 6-qt slow cooker. Stir in chicken broth and 2 cups water until well combined; season with salt and pepper, to taste.
Cover and cook on low heat for 7-8 hours or high heat for 3-4 hours. Stir in spinach until wilted.