Spray slow-cooker with cooking spray and spread 3/4 cup sauce on the bottom. Add optional 1/2 cup chopped veggies and then 3 lasagna noodles, breaking in half if necessary to fit. 1/2 cup cottage cheese mixture and then 1/4 cup mozzarella cheese. Repeat this process until you have four layers. Place lid on slow-cooker and cook on low for 3-4 hours until your noodles are al dente (depending on your slow-cooker). The first time you make this, check at 3 hours and note how long it takes in your specific slow-cooker.