In a mixing bowl, combine the chopped spinach, ricotta cheese, Parmesan cheese, garlic powder, nutmeg, salt, and pepper. Mix until well combined.
Sprinkle the flour onto a clean surface and turn the spinach cheese mixture out onto it.
Add the beaten egg to the spinach mixture and knead gently until it forms a soft dough. If the dough is too sticky, incorporate more flour until manageable.
Divide the dough into small portions and roll each portion into a thin circle, about 2-3 inches in diameter.
Place a teaspoon of the spinach and cheese filling in the center of each circle.
Carefully fold the dumpling over the filling to create a half-moon shape and pinch the edges to seal, ensuring there are no air pockets.
Bring a large pot of salted water to a boil. Once boiling, reduce to a gentle simmer and carefully drop the dumplings in batches.
Cook the dumplings for 3-4 minutes, or until they float to the surface. Remove with a slotted spoon.
In a skillet, heat olive oil over medium heat. Gently sauté the dumplings until lightly golden on both sides, about 2-3 minutes.
Serve hot with warm marinara sauce drizzled over the top.
Notes
Ensure to seal the dumplings well to prevent the filling from leaking during cooking.