Instant Pot Chicken Cacciatore Dump Dinner

Name: Instant Pot Chicken Cacciatore Dump Dinner
Ingredients: 2 tablespoons extra-virgin olive oil; 1 1/4 pounds boneless, skinless chicken thighs, cut into 1-inch chunks (about 6 thighs); Kosher salt and freshly ground black pepper; 1 pound farfalle; 3 cloves garlic, minced; 1 small onion, thinly sliced (about 1 cup); 1/4 cup pitted kalamata olives; 2 tablespoons capers, with liquid; One 20-ounce jar marinara sauce, jar reserved; 3 cups baby spinach or arugula, optional; Grated Parmesan, for serving; Fresh basil leaves, for serving