Creating this Sweet Potato & Spicy Sausage Gratin can be simplified by following these instruction steps:

1. Preheat Oven: Preheat your oven to 375°F (190°C).

2. Cook Sausage: In a large skillet over medium heat, add a splash of olive oil. Once hot, add the spicy sausage. Cook until browned and cooked through, about 8-10 minutes. Break it apart with a spatula for even cooking.

3. Sauté Vegetables: To the skillet, add the diced onion and cook for another 5 minutes until soft. Then, add minced garlic and cook for an additional 2 minutes until fragrant.

4. Prepare Sauce: In a bowl, combine heavy cream, smoked paprika, cayenne pepper, and a pinch of salt and pepper. Mix well.

5. Layer Ingredients: In a greased baking dish, start layering. Begin with a layer of sweet potatoes, followed by a layer of the sausage mixture. Pour some of the cream mixture over the top, then sprinkle a layer of cheese. Repeat this process until all ingredients are used, finishing with cheese on top.

6. Bake: Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes. After this, remove the foil and bake for an additional 15 minutes until the cheese is golden and bubbly.

7. Cool Slightly: Once golden, remove from oven and let it cool for about 10 minutes beforehand.

8. Garnish and Serve: Top with fresh parsley if desired. Slice and serve warm.

These straightforward steps make the preparation and cooking of Sweet Potato & Spicy Sausage Gratin not only enjoyable but also achievable for everyone.