Spray the inside of the slow cooker with non-stick cooking spray.
In a small bowl, combine 1 cup mozzarella with the ricotta and Parmesan cheese.
Add a thin layer of sauce to the bottom of the slow cooker.
Place a layer of lasagna noodles on top of the sauce. You’ll have to break them up to make an even layer. It’s ok to overlap the noodles.
Top with ⅓ of the ricotta mixture, then top with a layer of squash.
Top with sauce, then another layer of noodles.
Continue to layer ricotta, spinach, sauce, and noodles.
Add a final layer of ricotta, noodles, sauce, then cheese.
Put the crockpot on high for about 3 hours.
Let sit for a few minutes then cut and serve!
