Begin by popping 10 cups of unseasoned popcorn using an air popper or microwave. Once popped, pour the popcorn into a large mixing bowl. Carefully remove any unpopped kernels, then sprinkle salt liberally while the popcorn is still warm.

In a medium saucepan, melt 3 tablespoons of butter over medium heat. Stir gently to ensure the butter melts evenly without browning.

Quickly add 3 cups of mini marshmallows to the melted butter in the saucepan. Stir continuously over low heat until the marshmallows are completely melted and the mixture is smooth and shiny.

Gradually pour about a third of the melted marshmallow mixture over the popped popcorn. Using a spatula, gently fold the popcorn to ensure it’s well coated.

Once the popcorn is fully coated, line a cookie sheet with parchment paper for easy cleanup. Transfer the coated popcorn onto the sheet and spread it out evenly.

While the popcorn is still warm, sprinkle a mix of red and green M&Ms, pretzel M&Ms, additional mini marshmallows, and colorful Christmas sprinkles over the surface.

Allow the popcorn to cool completely on the cookie sheet at room temperature.

If there are any leftovers, store your Santa Crunch Popcorn in an airtight container at room temperature.