Add sausage to a frying pan over medium-high heat. Cook and crumble until no longer pink.
In a sauce pan over medium heat, add polenta, chicken broth and heavy cream. Mash and mix until polenta is reconstituted. Stir in cheese. Once melted, remove pan from heat.
In a bowl, combine sauce ingredients.
Add ⅔ of polenta to 13x9 baking dish. Top evenly with cooked sausage. and sprinkle with ¾ of spinach. Evenly pour red sauce over top. Then add remaining polenta. Sprinkle with remaining mozzarella. Roughly tear spinach into pieces and sprinkle over top. Bake for 30 minutes. Let rest at least 10 minutes before serving.
Keyword Italian Sausage, mozzarella, polenta, red sauce, spinach