Preheat your oven to 375°F (190°C). Using a vegetable peeler, slice the zucchinis lengthwise into thin strips, about 1/8 inch thick.
Place the zucchini strips on paper towels and sprinkle them lightly with salt. Let them sit for about 10-15 minutes to draw out excess moisture.
In a mixing bowl, combine the ricotta cheese, cream cheese, shredded mozzarella, grated parmesan, eggs, Italian seasoning, garlic powder, and crushed red pepper (if using). Mix until well combined and creamy.
Take a zucchini strip and spread a generous amount of the cheese mixture along one end. Roll it up tightly and place it seam-side down in your greased baking dish.
Pour the sugar-free marinara sauce over the roll-ups, ensuring all are covered. Sprinkle additional mozzarella and parmesan on top.
Cover the baking dish with aluminum foil and bake for 25 minutes. Remove the foil and bake for an additional 10-15 minutes or until the cheese is bubbly and golden.
Remove the roll-ups from the oven and let them cool for a few minutes. Serve warm, garnished with fresh basil or parsley if desired.