Preheat oven to 350 °F (175 °C) and lightly grease or oil a 13x9 inch baking dish.
Pour ½ cup marinara sauce over the bottom of the baking dish, Set aside.
In a large mixing bowl combine: ricotta cheese, cream cheese, ½ cup of the mozzarella cheese, 1 tablespoon of the Parmesan cheese, chopped spinach, Italian seasoning, garlic powder, and pepper. Mix until creamy.
Place 2 tablespoon down the center (lengthwise) of each chicken deli slices. Fold the sides of the slice over filling and press down slightly just to stick closed.
Places the rolled and filled meat (seam side up or down) into the prepared baking dish.
Pour remaining marinara sauce over the top of the rolls and sprinkle with remaining Mozzarella and Parmesan cheese.
Bake in the oven for 12 to 15 minutes. Removed from oven and serve.
Notes
*all nutritional data are estimates based on the products I used*Yield: 8 manicotti rolls, Servings: 4, Serving Size: 2 manicotti rolls, Net carbs per serving (2 rolls): 7g-