Cook 8 ounce box Manicotti pasta by boiling it as directed on the box until al dente.
Preheat the oven to 400℉.
In a 9x13-inch baking dish, spread a little less than half the marinara sauce on the bottom.
While the manicotti pasta is boiling, work on the filling. in a bowl, stir together 15 ounce tub ricotta cheese, 1 large egg, 2 cups of mozzarella cheese, ¼ cup of parmesan cheese, 1 teaspoon garlic powder and 2 teaspoons Italian seasoning.
Once the manicotti is done boiling, allow to cool in the strainer and drizzle just a little bit of olive oil over all the pasta so it doesn't stick together as it cools. Once they are cool enough to handle, gently fill the pasta with the cheesy filling and place into your baking dish.
This can be done very gently with a small spoon (so you don't break the pasta), or using a piping bag without a tip. You could also use a ziploc bag with the tip cut off and use it as a makeshift piping bag.
Once all manicotti is filled and in the dish, spoon over the rest of the marinara sauce, and sprinkle the rest of the cheeses on top.
Bake for about 30 minutes, or until all of the cheese is completely melted and golden.
Notes
Please refer to my FAQ’s (Frequently Asked Questions) and ingredient list above for other substitutions or for the answers to the most common questions.