Start by popping ½ cup of kernels your preferred way. I usually use a pot on the stove, but a microwave popper works too. Make sure to remove any unpopped kernels.
In a medium-large saucepan, melt the butter over medium-low heat. Once melted, add the mini marshmallows and stir until smooth and fully combined.
Combine Popcorn and Marshmallow Mixture
Pour the melted marshmallow mixture over the popcorn in a large bowl. Use a rubber spatula to gently coat all the popcorn.
After the popcorn cools slightly, fold in the M&Ms and Christmas sprinkles. This step adds color and festive fun to each ball.
Spray your hands with non-stick cooking spray. Scoop about a cup of the mixture and gently form it into a ball with your palms. Repeat with the remaining mixture.
Allow the popcorn balls to cool completely before serving. This ensures they hold their shape and stay soft but firm.