Preheat oven to 250 degrees F.
Popcorn can be air popped to reduce fat or cooked in oil (your choice).If cooked in oil, place the popped popcorn in a paper bag to help drain excess oil. Sprinkle with salt to taste.
In a small bowl, mix together the cheddar cheese powder, mustard powder, and chili powder; set aside.
In a small sauce pan or microwave, melt the butter. Pour the melted butter over the popcorn and shake or stir to coat popcorn evenly. Immediately pour the cheese mixture over the buttered popcorn; shake or stir to coat evenly.
Pour the Cheddar Cheese Popcorn mixture into a large roasting pan. Place in the preheated oven and bake for approximately 20 to 30 minutes, stirring every 10 to 15 minutes until the popcorn mixture has dried out and the moisture is gone. Remove from oven and serve immediately or let cool completely and store in airtight containers or re-sealable bags.
* Remember to remove any un-popped popcorn kernels.
** Often found in the popcorn section of most grocery stores. If unable to find cheddar cheese powder, purchase boxes of Macaroni and Cheese and use the powdered cheese flavor packets.
Cheddar Cheese Popcorn Recipe: https://whatscookingamerica.net/Appetizers/CheddarCheese-Popcorn.htm