Creating Zuppa Toscana Casserole is simple and rewarding. Follow these steps for a delicious outcome:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).
2. Cook the Sausage: In a large skillet over medium heat, add the Italian sausage. Cook until browned, breaking it apart with a spatula, about 5-7 minutes. Remove excess grease if needed.
3. Sauté the Onion and Garlic: Add the diced onion to the skillet with the sausage and cook until translucent, about 3-4 minutes. Stir in the minced garlic and cook for an additional 1-2 minutes.
4. Layer the Potatoes: In a greased 9×13-inch baking dish, layer half of the sliced potatoes evenly across the bottom.
5. Add Sausage Mixture: Spoon the sausage and onion mixture over the potatoes, spreading it evenly.
6. Seasoning: Sprinkle the dried oregano, salt, and black pepper over the mixture.
7. Add Kale: Layer the chopped kale on top of the sausage mixture.
8. Pour Broth: Carefully pour the chicken broth over the layers in the baking dish.
9. Add Remaining Potatoes: Layer the remaining sliced potatoes on top.
10. Cover and Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes.
11. Stir in Cream: Remove the foil and stir in the heavy cream. Sprinkle the shredded mozzarella and grated Parmesan cheese evenly on top.
12. Bake Uncovered: Return the casserole to the oven and bake uncovered for another 15-20 minutes, or until the cheese is bubbly and golden brown.
13. Garnish: Remove from the oven and let it sit for a few minutes. Garnish with fresh parsley before serving.

These steps will guide you in creating an incredible Zuppa Toscana Casserole that everyone will love!