Preheat your oven to 200°C (390°F). Lightly spray a large oven-proof baking dish with non-stick spray.
Heat the oil in a large pan over medium-high heat. Add the onion and garlic and cook until the onion becomes transparent (about 1-2 minutes). Add the diced carrot and pumpkin, cooking for 5-7 minutes until they start to soften. Add the mushrooms and zucchini and cook for another 5 minutes until all vegetables are tender.
Add the ground chicken to the pan with the vegetables. Use a spoon to break up the meat and cook until it's browned all over.
Pour in the condensed tomato soup, add the vegetable stock powder and add the fresh basil, stir and simmer for 2 mins.
Assemble
Spread about 1 ½ cups of the chicken sauce on the bottom of your prepared baking dish. Arrange 3 lasagna sheets over the sauce.
Top the sheets with another 1 ½ cups of sauce.
Evenly spoon half of the ricotta over the sauce, then sprinkle with half of the mozzarella cheese.
Repeat the layers: Add the remaining 3 lasagna sheets, the rest of the sauce, the remaining ricotta, and finish with the remaining mozzarella on top.
Cover the dish with foil and bake for 40 minutes. After 40 minutes, remove the foil and change the oven setting to grill (or broil) on medium heat. Grill for 3-5 minutes, or until the cheese on top is golden and bubbly.
Remove the lasagna from the oven and let it stand for 10-15 minutes. This helps the layers set, making it easier to slice and serve. Enjoy!
Notes
Pumpkin Shortcut: To save time, buy pre-peeled and pre-chopped pumpkin from the grocery store. Just make sure the pieces are chopped finely (about 1-2 cm cubes) so they cook quickly and evenly with the other vegetables.
Spreadable Ricotta: Ricotta can be tricky to spread. For an easier and creamier layer, mix the ricotta in a separate bowl with a pinch of salt and pepper before dotting it over the sauce.
Lasagna Sheets: You don't need to pre-boil the lasagna sheets. The sauce has enough moisture to cook them perfectly in the oven. Feel free to snap the sheets to fit the corners of your dish.
Prevent Sticking: Lightly spray the inside of the foil with cooking spray before covering the lasagna. This stops the top layer of cheese from sticking to it when you bake.
Check for Doneness: The lasagna is ready when the cheese is golden and bubbly, and you can easily pierce the layers with a knife. The pasta should feel tender, not hard.
Make-Ahead Tip: You can fully assemble the lasagna up to 24 hours in advance. Just cover it tightly and store it in the fridge. You may need to add 10-15 minutes to the baking time when cooking it straight from the cold.
Avoid Spills: Place your baking dish on a larger baking tray before putting it in the oven. This will catch any sauce that might bubble over, keeping your oven clean.