Creating Stuffed Lasagna Portobellos can be a satisfying and enjoyable process. Just follow these simple steps:

1. Preheat the Oven: Set your oven to 375°F (190°C).
2. Prepare the Mushrooms: Clean the Portobello mushrooms with a damp cloth. Remove the stems and gently scrape out the gills with a spoon to create space for the filling.
3. Mix the Filling: In a mixing bowl, combine the ricotta cheese, half the mozzarella cheese, Parmesan cheese, egg, Italian seasoning, minced garlic, salt, and pepper. Stir until fully mixed and creamy.
4. Stuff the Mushrooms: Place the mushrooms on a baking sheet, gill side up. Spoon a generous amount of the cheese filling into each mushroom cap, pressing down slightly to fit.
5. Add Marinara Sauce: Spoon a dollop of marinara sauce over the filling in each mushroom.
6. Top with Cheese: Sprinkle the remaining mozzarella cheese evenly over the stuffed mushrooms.
7. Bake: Place the baking sheet in the preheated oven and bake for 20-25 minutes, or until the mushrooms are tender and the cheese is golden and bubbling.
8. Garnish: Remove from the oven and let cool slightly. Garnish with fresh basil if desired.
9. Serve: Plate and serve hot, providing extra marinara sauce on the side if desired.

These steps will help you craft this incredible dish with ease.