Slow Cooker Mushroom Spinach Lasagna

Name: Slow Cooker Mushroom Spinach Lasagna
Ingredients: Nonstick cooking spray, such as PAM; 1 Tablespoon olive oil; 1 8-ounce package fresh sliced mushrooms; 1 6-ounce package baby spinach leaves; 1 14.5-ounce can diced tomatoes with basil, garlic, and oregano, un-drained, such as Hunt's; 2 Cups tomato sauce, such as Hunt's; ½ Teaspoon dried Italian seasoning; ¼ Teaspoon salt; 1 8-ounce container part-skim ricotta cheese; ½ Cup grated Parmigiano-Reggiano; ¼ Teaspoon ground black pepper; 6 dry lasagna noodles, uncooked; 1½ Cup shredded Italian blend cheese