Roasted Parmesan Potatoes

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4 tablespoons salted butter, melted

1 tablespoon olive oil 

1 teaspoon garlic powder 

1 teaspoon onion powder 

1 teaspoon smoked paprika 

1/2 teaspoon flaky sea salt 

Freshly ground black pepper 

4 tablespoons grated Parmesan cheese 

2 pounds russet potatoes, cut in 1/4-inch slices

Nonstick cooking spray, for the baking sheets

1/4 cup chopped fresh parsley