In a mixing bowl, combine the matzo meal, salt, black pepper, garlic powder, and onion powder.
In a separate bowl, whisk the eggs, vegetable oil, and seltzer water until well combined.
Pour the wet mixture into the dry ingredients and mix until a sticky dough forms.
Cover the bowl and refrigerate for at least 30 minutes to firm up the dough.
In a large pot, bring the chicken soup to a gentle simmer.
With wet hands, form the dough into walnut-sized balls and drop them into the simmering soup.
Cover the pot and let the matzo balls cook for about 25-30 minutes until they are firm and fluffy.
Serve the matzo ball soup hot, garnished with chopped fresh parsley.