Ingredients
1 cup minced red onion
2 tablespoons unsalted butter
1 1/2 cups cooked and drained spinach, chopped
2 teaspoons minced garlic
1 15-ounce container ricotta cheese
1/2 cup coarsely grated mozzarella
1/2 cup grated parmesan cheese
1 large egg, beaten lightly
Salt and pepper to taste
Freshly grated nutmeg to taste
8 manicotti shells
Parsley for garnish if desired

Marinara Sauce

Instructions
Preheat oven to 350 degrees.

In a skillet set over moderate heat cook the onion in the butter, stirring occasionally, for 5 minutes.

Add the spinach, garlic and cook, stirring, 3 to 4 minutes, or until heated through. Transfer mixture to a bowl, add remaining ingredients (using only 1/4 cup of mozzarella and 1/4 cup parmesan) and gently stir to combine well.

Cook the manicotti in boiling salted water until just al dente. With a slotted spoon transfer to a bowl of cold water, drain and pat dry. Gently stuff shells with filling and arrange in a buttered baking dish.

Cover the bottom of a 13 x 9 pan with marinara sauce. Layer in the filled manicotti, cover with sauce and sprinkle the remaining cheeses on top. Cover with foil and bake for 30 minutes. Uncover and bake for 10-15 minutes longer. Let rest 5 minutes. Sprinkle with fresh Parsley.