Preheat your oven to 375°F.
Cook lasagna noodles until tender.
Mix ricotta, egg, and seasonings together.
Spread white sauce in baking dish.
Layer noodles over the sauce.
Add ricotta mixture on noodles.
Sprinkle chicken over ricotta layer.
Add mozzarella cheese on top.
Repeat layers two more times.
Cover dish with aluminum foil.
Bake for 25 minutes covered.
Remove foil and bake 15 minutes.
Cut ghost shapes from mozzarella slices.
Place ghosts on hot lasagna.
Add olive pieces for eyes.
Let it rest 10 minutes.