Sauté the onion and garlic in the Instant Pot until softened.
Add the sliced zucchini, yellow squash, and red bell pepper. Cook for a few minutes until slightly tender.
Stir in the spinach and marinara sauce. Season with salt, pepper, and Italian seasoning.
In a separate bowl, mix the ricotta, mozzarella, and Parmesan cheese.
Layer the lasagna in the Instant Pot starting with the vegetable mixture, followed by a layer of lasagna noodles, and a layer of cheese mixture. Repeat until all ingredients are used, ending with a layer of cheese on top.
Close the Instant Pot and cook on high pressure for 25 minutes.
Allow the pressure to release naturally before opening the pot.
Serve the vegetable lasagna hot and enjoy!
Notes:
This recipe is perfect for a quick and healthy meal. Feel free to add other vegetables or substitute the cheese to suit your taste.