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Italian Sausage Casserole

This Italian Sausage Casserole is delicious and loaded with flavors from meat, herbs, and vegetables! A healthy and yummy option for those in a gluten-free and low-carb diet, too! Perfect winter comfort food.
Course Dinner, Main Course
Cuisine Great Britain, Italian
Keyword baked italian sausage recipe, Italian sausage casserole, italian sausage casserole keto, italian sausage recipes, italian sausage recipes without pasta, recipes for hot italian sausage casserole
Prep Time 10 minutes
Cook Time 40 minutes
Total Time 50 minutes
Servings 8
Author Manila Spoon


  • 3 pounds about 10-12 pieces good quality Italian Sausages, left whole or sliced into bite-sized pieces if preferred
  • 4 tbsp olive oil
  • 1 large onion, peeled and chopped
  • 4 cloves garlic, peeled and sliced
  • 10 oz mushrooms sliced
  • 1/2 cup dry red wine, use gluten-free or wheat-free wine if on that diet
  • 8 oz cooking spinach fresh or frozen (if frozen, defrost and drain well)
  • 2 cups unsalted crushed tomatoes, fresh or canned
  • 3 fresh sprigs of rosemary, (or 1-2 teaspoons dried or to taste)
  • 2 dried bay leaves
  • handful of fresh basil, (optional but encouraged!
  • salt and pepper (to taste), and a little (about 1 tsp) brown sugar, for seasoning (sugar is optional and maybe left-out if doing low-carb)


  1. Preheat the oven to 350 F. Heat the olive oil in an oven-safe casserole (like a cast iron or Dutch oven) and brown the sausages (whole or sliced). Transfer the sausages to a plate.
  2. In the same pan, saute the onions and garlic for a couple of minutes. Pour in the red wine and deglaze the pan, scraping the brown bits on the bottom of the casserole dish. Add the fresh or frozen spinach and cook until wilted. Turn off the heat.
  3. Add the mushrooms, crushed tomatoes, rosemary and bay leaves. Season with a little salt and pepper, to taste. Transfer the sausages back to the casserole dish. Give a quick stir. Bake in the preheated oven for 30-40 minutes.
  4. If using fresh basil, simply stir them into the casserole. To enhance the flavor some more stir in a teaspoon or 2 of sugar. The last step is optional, especially if doing a low-carb diet. Enjoy over pasta or rice!