Preheat oven to 400F. Heat a large skillet with olive oil over medium heat. Add in all of the chopped and prepared vegetables, season with salt and pepper and cook until veggies begin to slightly soften - 4-5 minutes. Remove from heat and set aside.
To assemble our lasagna, begin by ladeling 1/3 of the bechamel sauce into a baking dish - evenly disperse to cover the dish.
Next, lay four lasagna noodles side-by-side in the dish on the bechamel sauce. Spoon 1/3 of the cooked vegetables, followed by 1/3 of the baby spinach on top of the noodles.
Now for the cheese. Dollop/spread 1/3 of the mascarpone as best as you can on top of the vegetables. Then, 1/3 of the mozzarella chunks.
Parmesan is next and don't be shy with it, use 1/3 of the grated amount.
Repeat steps two more times for a total of three loaded layers.
Cover with foil and bake for 45 minutes. Remove foil and then bake for another 25.
Remove from oven, tent with foil and allow to cool for 20 minutes or so before eating. Serve with more parmesan, olive oil and fresh mint.