Cheese and Caramel Popcorn

Name: Cheese and Caramel Popcorn
Ingredients: 6 cups freshly popped plain popcorn; 4 tablespoons unsalted butter, melted; 1/3 cup orange Cheddar cheese powder (see Cook's Note); 1 teaspoon mustard powder; 1/4 teaspoon white pepper; Vegetable oil cooking spray; 6 cups freshly popped plain salted popcorn; 4 tablespoons unsalted butter; 1/4 cup plus 2 tablespoons granulated sugar; 2 tablespoons light brown sugar; 2 tablespoons light corn syrup; 1/2 teaspoon kosher salt; 1/4 teaspoon baking soda