Instant Pot Vegan Baked Ziti

Ingredients

• 2 tablespoons olive oil
• 1 cup diced yellow onion
• 1 1/2 cups diced mushrooms
• 1 1/2 cups diced eggplant
• 2 garlic cloves, minced
• 1 teaspoon kosher salt
• 3/4 teaspoon black pepper
• 2 cups water
• 1 pound uncooked ziti pasta
• 1 (24-oz.) jar marinara sauce
• 2 tablespoons fresh chopped flat-leaf parsley
• 2 tablespoons fresh chopped basil
• 2 cups shredded vegan mozzarella, optional