Follow these simple steps to create your Irresistible Tomato Lasagna:

1. Preheat Oven: Preheat your oven to 375°F (190°C).
2. Cook the Noodles: In a large pot of boiling salted water, cook the lasagna noodles according to package instructions. Drain and set aside.
3. Prepare the Sauce: In a large skillet, heat olive oil over medium heat. Add chopped onion and sauté until translucent, about 5 minutes. Stir in minced garlic and cook for an additional minute.
4. Add Tomatoes and Herbs: Pour in the crushed tomatoes and tomato paste. Add oregano, basil, and red pepper flakes if using. Season with salt and pepper. Simmer for 20 minutes, stirring occasionally.
5. Mix Ricotta Filling: In a bowl, combine ricotta cheese, egg, and a pinch of salt. Mix until smooth.
6. Assemble the Lasagna: In a 9×13 inch baking dish, spread a thin layer of the tomato sauce on the bottom. Layer 3 lasagna noodles over the sauce, then spread half of the ricotta mixture on top, followed by a third of the mozzarella and a sprinkle of Parmesan. Repeat the layers, ending with noodles topped with remaining sauce and cheeses.
7. Bake the Lasagna: Cover the dish with aluminum foil and bake for 30 minutes. Remove the foil and bake for an additional 15-20 minutes until the cheese is bubbly and golden brown.
8. Rest: Remove the lasagna from the oven and let it rest for 15-20 minutes before slicing.
9. Garnish: If desired, garnish with fresh basil leaves before serving.

These steps will guide you in creating this amazing dish effortlessly, ensuring a heartwarming experience from your kitchen to your table.