Begin by popping 10 cups of popcorn using an air popper or stovetop method. Transfer to a large mixing bowl and sprinkle liberally with salt.

In a medium saucepan, melt 3 tablespoons of sweet cream salted butter over medium heat for about 2-3 minutes.

Add 3 cups of mini marshmallows to the saucepan and stir for approximately 3-4 minutes until fully melted and smooth.

Carefully pour about one-third of the marshmallow mixture over the popcorn and gently fold to coat. Repeat with remaining mixture in two additions.

Spread the coated popcorn onto a lined cookie sheet and allow to set at room temperature for about 10-15 minutes.

While the popcorn is still warm, generously sprinkle red and green M&Ms and Christmas sprinkles over the top.

Once cooled, break into bite-sized pieces and transfer to a festive serving bowl.