Step 1: Cook the Lasagna Noodles : Bring a large pot of salted water to a boil. Cook the noodles according to package directions until just al dente. Drain and lay them flat on parchment paper or a baking sheet to prevent sticking.

Step 2: Prepare the Meat Sauce : In a large skillet, heat olive oil over medium heat. Add the ground beef (or sausage) and cook until browned, breaking it apart with a spoon. Add onions and cook until soft, about 3 minutes. Stir in garlic and cook for another 30 seconds. Add marinara sauce, Italian seasoning, salt, pepper, and red pepper flakes. Simmer for 10–15 minutes, stirring occasionally. Remove from heat.

Step 3: Make the Cheese Filling : In a mixing bowl, combine ricotta, mozzarella, Parmesan, egg, parsley, salt, and pepper. Mix well until smooth and creamy.

Step 4: Assemble the Roll-Ups : Preheat your oven to 375°F (190°C). Spread about ½ cup of the meat sauce on the bottom of a greased 9x13-inch baking dish. Lay out one lasagna noodle at a time on a clean surface. Spread 2–3 tablespoons of the cheese mixture evenly over each noodle. Spoon a thin layer of meat sauce on top of the cheese. Carefully roll up the noodle from one end to the other. Place each roll seam-side down in the prepared baking dish.

Step 5: Add Sauce and Cheese on Top : Spoon the remaining meat sauce over the top of all roll-ups. Sprinkle with shredded mozzarella and Parmesan cheese.

Step 6: Bake the Lasagna Roll-Ups : Cover with foil and bake for 25 minutes. Remove foil and bake uncovered for another 10–15 minutes, until bubbly and golden on top. Let rest for 5–10 minutes before serving.