First, get a Dutch oven, and cook the Italian sausage and red pepper flakes in it on medium-high heat for about 10 minutes, till they are no longer pink. Drain the Italian sausages, and keep them on a plate.
Now, cook the bacon in the same oven for about 10 minutes until it is crispy. Drain the bacon a bit and still leave it at the bottom of the Dutch oven.
Add the onions and garlic to the Dutch oven with the bacon still in, and allow them to cook for about 5 minutes.
Now, pour the chicken broth into the bacon, onions, and garlic mix. Increase the heat to high, and let it boil.
Now, add the potatoes to the boiling mixture and allow it to cook for about 20 minutes until it is soft.
Reduce the heat, and add in the cooked sausages that we set aside, pour in the heavy cream. Stir the mixture until everything is properly mixed together and leave on heat for about 5 minutes.
Add in the spinach and stir it in properly. Allow to sit for about 2 minutes then turn off the heat.
Viola!, you have prepared the famous Zuppa del Giorno soup. Serve and enjoy while it is hot.