Creamy Tuscan Tortellini Soup

Ingredients

• 2 tbsp olive oil
• 2 tbsp butter
• 1 yellow onion, diced
• 5-6 celery stalks, diced
• 4 garlic cloves, minced
• 1 tbsp dried oregano
• 1 tsp salt
• 1 tsp pepper
• 1 tsp crushed red pepper flakes
• 1 lb ground Italian sausage
• 32 oz chicken broth
• 28 oz crushed tomatoes
• 10 oz cheese tortellini
• 1/2 cup heavy cream
• 4 cups kale, de-stemmed & diced
• Fresh grated Parmesan to top