Hearty Chicken Sausage Soup with White Beans and Kale (Easy One-Pot Dinner)

Ingredients

• 1 tablespoon olive oil
• 12 oz (340 g) fully cooked Italian chicken sausage, sliced into 1/2-inch rounds
• 1 medium yellow onion, diced
• 2 medium carrots, diced
• 2 celery ribs, diced
• 4 garlic cloves, minced
• 1 tablespoon tomato paste
• 1 teaspoon Italian seasoning
• 1/4 teaspoon red pepper flakes, optional
• 1/2 teaspoon kosher salt, plus more to taste
• 1/4 teaspoon black pepper
• 1 can (14.5 oz or 410 g) fire-roasted diced tomatoes
• 2 cans (15 oz each or 425 g each) cannellini or great northern beans, drained and rinsed
• 6 cups (1.4 L) low-sodium chicken broth
• 1 Parmesan rind, optional
• 1 bunch kale, stems removed and leaves chopped
• 1 tablespoon fresh lemon juice, plus more to taste
• Grated Parmesan, for serving, optional
• Extra virgin olive oil, for serving, optional