
Toss butternut squash in a large mixing bowl with olive oil. Season with salt and pepper.
In a medium bowl, mix ricotta, basil, garlic powder, egg and milk. Season with salt and pepper.
Cover the bottom of the slow cooker with 1 cup of sauce. Layer 3 noodles on top, breaking as needed to fit. Spread 1/3 of ricotta mixture over the noodles. Add 1/3 of kale and butternut squash over the ricotta. Top with 1 cup of sauce. Repeat this layering 2 more times. Top with one more layer of noodles and sauce.
Cover and cook on low for 5 hours. Top with mozzarella cheese and cover for about 10 minutes (or until melted).