Serves 8 to 10 as a side dish or 4 as a main course

1 batch Crunchy Onion Topping (recipe below)

1 tablespoon butter, plus more to grease the dish

1 tablespoon olive oil

2 slices turkey bacon, finely diced

1 medium onion, diced

2 large carrots, diced

2 large stalks celery, diced

1/2 medium red bell pepper, diced

2-3 cloves garlic, minced

1/2 teaspoon dried thyme leaves

1/4 teaspoon dried crushed oregano

1/4 teaspoon salt

1/8 teaspoon black pepper

1 bay leaf

1 1/2 tablespoons flour

2 cups low-sodium vegetable or chicken stock

2 tablespoons tomato paste

1 (16 oz) can no-salt-added cannellini beans or other white beans