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Heat oven to 350°F and spray 13x9-inch baking dish with nonstick cooking spray.
Place potatoes in a large saucepan, over medium-high heat, and cover them with cold water. Bring the water to a boil and reduce the heat to low. Cook, uncovered 8-10 minutes or until the potatoes are just fork tender. Drain the potatoes and place them in the prepared baking dish.
Pour the melted butter over the potatoes.
While the potatoes cook, crumble the sausage in a large skillet set over medium heat. Add the chopped onion and cook until the onion is translucent and the sausage is cooked through. Transfer the sausage/onion mixture to a paper towel-lined plate and dab the top of the mixture with another paper towel.
Spread the sausage/onion mixture over the potatoes and gently toss the mixture together.
Top with cheese and bake, uncovered, at 350°F for 7-10 minutes or until the cheese is melted.
Garnish with chopped parsley, if desired, and serve.