Cook the sausage: Heat a large skillet over medium heat. Add the Italian sausages (whole or sliced into rounds, as preferred) and cook until browned and cooked through, about 5-7 minutes, turning occasionally to ensure even browning. Remove the sausages and set aside.

Sauté the vegetables: In the same skillet, add the sliced bell peppers and onions. Stir frequently and cook until the vegetables are softened, about 5 minutes.

Add garlic: Stir in the minced garlic and cook for another minute, until fragrant.

Make the creamy sauce: Pour in heavy cream, stirring gently to combine. Let the mixture simmer for about 3-5 minutes, or until the sauce slightly thickens. Add salt and pepper to taste.

Prepare mashed potatoes: While the sausage and peppers are simmering, prepare the mashed potatoes. Boil the peeled and chopped potatoes in salted water until tender, about 15-20 minutes. Drain the potatoes and return them to the pot.

Mash the potatoes: Mash the potatoes with butter and heavy cream until smooth and creamy. Season with salt and pepper to taste.

Assemble the dish: Serve the creamy sausage and peppers mixture over a bed of mashed potatoes. Garnish with fresh parsley if desired.