Healthy Lentil Soup

Ingredients

• 3 tablespoons olive oil
• 1 stalk celery, diced
• 1 carrot, diced
• 1 onion, diced
• 3 cloves garlic, minced
• 6 cups chicken broth (or vegetable broth for a vegetarian alternative)
• 1 can (15 ounces) diced tomatoes, undrained
• 1½ cups lentils, rinsed
• 2 bay leaves
• ½ teaspoon dried thyme (or 1 teaspoon fresh thyme, chopped)
• ½ teaspoon dried oregano (or 1 teaspoon fresh oregano, chopped)
• Salt, to taste
• Pepper, freshly ground, to taste
• 2 cups spinach leaves, loosely packed