1 Heat oven to 350-degrees Farenheight. 2 Place popcorn in a 9 x 13-inch baking pan that has been lined with foil; set asie. 3 Place butter in small bowl and microwave about 20 seconds or until melted. 4 Pour butter over popcorn and toss to coat. Sprinkle Parmesan cheese and lemon pepper over popcorn and toss again. Bake 7-10 minutes or until heated through. 5 Toss again just before serving. Serve immediately or cool completely and store in an airtight container.