Stir in onion and garlic and cook until softened and fragrant, about 3 minutes. Add thyme and cook 2-3 minutes. Add to warmed crockpot along with the bay leaves, broth, plus the squash and dry lentils.
Stir, cover and cook in crockpot for 3-4 hours on high or until squash is very tender.
Meanwhile, in a large pot, cook pasta according to package directions until it’s al dente.
Once the squash is cooked, remove bay leaves from mixture.
Using an immersion blender, puree the squash to create a smooth sauce.
Stir in milk and cheddar cheese.