Slow Cooker Pasta

Bahan-bahan (6 porsi)

• 2 teaspoons extra-virgin olive oil
• 16 ounces sliced cremini baby bella mushrooms
• 1 small red onion (or yellow onion, diced)
• 1 red bell pepper (cored and diced)
• 5 cups lightly packed fresh baby spinach (about 4 ounces)
• 2 cloves garlic (minced)
• 15 ounces part-skim ricotta cheese ((1 container))
• 1 large egg
• 1/2 teaspoon kosher salt
• 1/2 teaspoon ground black pepper
• 1 1/2 cups shredded part-skim shredded mozzarella cheese (divided)
• 1/2 cup freshly grated Parmesan cheese (about 1 1/4 ounces)
• 2 jars good-quality red pasta sauce ((24-ounce jars) divided)
• 16 ounces uncooked whole wheat ziti (or penne noodles, or swap a similar short, hollow noodle—see notes if not using whole wheat)
• Chopped fresh basil (or parsley, optional for serving)