Preheat the oven to 350℉ (180℃) and grease a 13 by 9 by 2-inch baking dish with olive oil.
Heat a heavy medium skillet over medium heat. Add ground beef, salt, black pepper, dried minced onion, and minced garlic. Sauté until the meat browns, and the garlic is fragrant (about 5 minutes). Remove from the heat, and cool.
In a large bowl, combine the ricotta, ½ cup of the mozzarella cheese, ¼ cup of Parmesan cheese, garlic powder, and the dried parsley. Mix together.
Using a slotted spoon, add the cooled meat mixture into the cheese mixture and combine. Set aside.
Spoon 1 cup of the marinara sauce over the bottom of the prepared dish.
Fill and roll up each of the egg white wraps with about four tablespoons of the cheese-meat mixture.
Arrange the stuffed rolls in a single layer in the prepared dish and spoon the remaining 1 cup of marinara sauce over them.
Sprinkle the remaining 1 cup of mozzarella cheese and the remaining ¼ cup of Parmesan cheese over the top of the stuffed manicotti.
Dot the entire dish with the butter pieces. Bake the manicotti uncovered until heated through for 25 to 30 minutes. Let the manicotti stand for 4 minutes and serve.

PREP TIME & NUTRITION:
Prep Time: 8 minutes, Cook Time: 25 minutes, Total Time: 33 minutes, Servings: 6, Calories: 350, Net Carbs: 6g, Fats: 22g, Protein: 23g