Preheat the oven to 350°
In a large skillet, heat the oil and add the onion, mushrooms, bell pepper, zucchini, broccoli and garlic. Season them with salt, pepper and garlic powder and sauté the vegetables until they are soft. This should take about 7-10 minutes
For the white sauce, n a medium sized saucepan, melt the butter over medium high heat and whisk in the flour for about 2 minutes.
Slowly pour in the milk then bring it to a boil and reduce the heat to low.
Once the sauce starts to thicken, stir in the Parmesan cheese, spinach and the garlic powder.
Spray a 9” x 13” baking dish with cooking spray and add about a cup of the spinach and white sauce to the bottom.
Lay down the lasagna sheets, side by side until they are covering the bottom and spread out half of the vegetables on top.
Add ½ a cup of shredded mozzarella cheese (or 6 slices), and dollop half of the ricotta cheese in random spots over the vegetables.
Add another layer of lasagna sheets, the rest of the vegetables ½ cup of mozzarella cheese, ¼ cup of parmesan cheese, and another cup of the white sauce.
Add a final layer of lasagna sheets, and pour over the rest of the white sauce mixture.
Add the rest of the mozzarella cheese and Parmesan cheese.
Then, place it into the oven for about 40 minutes or until the cheese is melted and the sides are hot and bubbly.
Finally, let the lasagna cool for about 5-10 minutes before slicing, sprinkle the top with parsley (if desired) and serve warm. Enjoy!