Pop the corn. Heat 2–3 tablespoons of oil in a large pot over medium-high. Add 1/2 cup kernels, cover, and shake occasionally.
When popping slows to 2–3 seconds between pops, remove from heat. Yields about 12–14 cups.
Spread and season. Transfer popcorn to a large bowl or two sheet pans. While it’s still warm, mist lightly with oil (optional) so seasonings stick.
Sprinkle salt and your chosen seasonings evenly, tossing as you go.
Add mix-ins. Let the popcorn cool fully first to avoid melting chocolate or softening dried fruit. Fold in a handful or two of your chosen extras. Keep the ratio around 4 parts popcorn to 1 part mix-ins for balance.
Portion it out. Scoop about 2 cups per snack bag for a standard serving. Squeeze out extra air before sealing to keep things crisp.
Label and store. Mark the date and flavor on each bag.
Keep at room temperature in a cool, dry spot.