01 -
Preheat the oven to 200°C (400°F). Toss zucchini, yellow squash, red and orange bell peppers with olive oil, minced garlic, salt, and black pepper. Spread evenly on a baking tray and roast for 20 minutes until tender.
02 -
Heat a small amount of olive oil in a pan over medium heat. Add fresh spinach and sauté until wilted, then set aside.
03 -
In a saucepan, melt butter over medium heat. Whisk in flour until smooth and cook for 1-2 minutes. Gradually add milk while whisking continuously. Cook until the sauce thickens. Stir in nutmeg, salt to taste, and grated Parmesan cheese.
04 -
In a 23×33 cm (9×13 inch) baking dish, spread a thin layer of béchamel sauce. Layer lasagna noodles, roasted vegetables, wilted spinach, dollops of ricotta, béchamel sauce, and shredded mozzarella. Repeat the layering process.
05 -
Complete the assembly with a final layer of noodles topped with béchamel sauce and both cheeses evenly distributed.
06 -
Cover the dish with foil and bake at 190°C (375°F) for 25 minutes. Remove the foil and continue baking for an additional 10 to 15 minutes until the top is golden brown and bubbly.
07 -
Allow the dish to rest for 10 minutes before slicing and serving to ensure clean portions.