Add olive oil to a large pan over medium heat
Cook the italian sausage and onion in the pan until cooked through.
Add minced garlic and italian seasoning to pan, and cook an additional one minute.
Put the sausage mixture into a crockpot, along with the chicken broth and diced tomatoes. Stir together.
Cook the ingredients in the crockpot for 4-5 hours on high or 7-8 hours on low.
30 minutes before the cooking time is done, add the tortellini, parmesan cheese, fresh spinach and heavy cream.
Enjoy!