In a medium mixing bowl, pour in 1 cup of ranch dressing. Add half of the sliced black olives and stir until well-distributed.

Gently transfer the mixture to a serving dish and smooth out the top with a spatula.

Sprinkle the remaining black olive slices evenly across the top to mimic spider eggs.

Place the large black olive in the center to represent the spider and press down gently.

Serve immediately or refrigerate for up to an hour if you prefer it chilled.