Toss butternut squash chunks with 2 teaspoons olive oil.
Place butternut squash in a 375 degree F oven to roast for 45 minutes or until soft.
Meanwhile, cook lasagna noodles according to package directions.
When the butternut squash is soft ( you get easily put a fork through it) remove from the squash from the oven and let cool.
When squash is cooled mash with a potato masher and add Mascarpone Cheese and mix well.
Spinach:
In a sauté pan heat 1 teaspoon of olive oil of medium heat.
Add washed and dried spinach to the sauté pan.
Cook spinach until wilted, remove from heat.
Stir spinach into ricotta cheese.
Parmesan Cheese Sauce:
Heat 1 teaspoon olive oil over medium heat.
Add in 1 clove garlic minced and cook for 1-2 minutes.
Slowly add in flour, stirring to make a roux.
Slowly whisk in milk, heat until scalded.
Remove from heat and slowly add in ¼ cup (2 ounces) of Parmesan Cheese and stir until melted.
Assemble Lasagna:
In a 9x9 inch baking pan spread about ¼ cup of Parmesan Cheese sauce to coat pan.
Place three noodles on the bottom of the pan, trim to fit pan.
Spread butternut squash mixture on the noodles.
Add another layer of noodles.
Next spread in ricotta/spinach mixture.
Add the last layer of noodles.
Pour remaining parmesan cheese sauce over the top layer of noodles.
Add mozzarella cheese and remaining parmesan cheese to the top.
Bake in a preheated 350 degree F oven for 20-30 minutes or until cheese melts and is bubbly.
Notes
You can use store prepared butternut squash. There is no shame in letting someone else cut it up.
If you do buy a whole butternut squash microwave the squash for 3-31/2 minute to soften it before you attempt to peel and chop up the squash. This will make the job a lot easier (and safer).
To speed up cooking time you can prep the butternut squash the night before. In a pinch, you could you frozen butternut squash and skip the roasting step.
You don't have to use butternut squash: acorn squash and delicata would be great substitutions.
You can add any veggie you want. If you don't like spinach add in another veggie or eliminate it altogether.