Preheat the oven to 400°F (200°C).
In a large pot, bring salted water to a boil. Add the diced potatoes and cook for about 10 minutes, or until just tender. Drain and set aside.
In a large skillet, heat the olive oil over medium heat. Add the chicken pieces and season with salt, pepper, and Italian seasoning. Cook until the chicken is browned and cooked through, about 5-7 minutes.
Add the minced garlic to the skillet and sauté for 1-2 minutes until fragrant.
Reduce the heat to low and stir in the heavy cream. Allow it to simmer for 2-3 minutes, then add the cooked potatoes and half of the cheddar cheese. Stir until everything is well combined and the cheese is melted.
Transfer the mixture to a greased 9x13 inch baking dish. Sprinkle the remaining cheddar cheese on top.
Bake in the preheated oven for 20-25 minutes, or until the cheese is bubbly and golden.
Remove from the oven and let it cool for a few minutes. Garnish with chopped parsley before serving.