Preheat oven to 450 degrees Fahrenheit, prepare a sheet pan by spraying with nonstick cooking spray.Toss potatoes in the olive oil to coat slightly, then add in garlic salt, seasoned black pepper and garlic. Using a wooden spoon mix all the ingredients together.Pour on to prepared sheet pan and sprinkle thyme on top and pour melted butter over the potatoes.Bake for 25-30 minutes or until golden brown, garnish with fresh thyme and pepper.