Heartwarming Slow Cooker Lasagna

Ingredients

• 1 teaspoon freshly ground black pepper
• 1/4 cup chopped fresh parsley
• 1 pound ground Italian sausage
• 1 pound ground beef
• 2 cups shredded mozzarella cheese
• 1 teaspoon kosher salt
• 1/2 cup grated parmesan cheese
• 32 ounces whole-milk ricotta cheese
• 12 ribbon-edged lasagna noodles, broken as necessary to cover the slow cooker
• 48 ounces spaghetti sauce