Williams Sonoma Slow Cooker Lasagna

Ingredients

• 1/2 tablespoon olive oil
• 2 pounds italian sausage casings removed
• 48 ounces spaghetti sauce
• 2 cups water
• 15 ounces whole milk ricotta cheese
• 2 tablespoons chopped parsley
• salt
• ground pepper
• 16 lasagna noodles NOT no-boil
• 1 1/2 pounds shredded mozzarella or however much you have in the bottom of your cheese drawer
• 1/2 cup grated Parmesan cheese or shredded