Instant Pot Savory Oatmeal with Sautéed Wild Mushrooms

Name: Instant Pot Savory Oatmeal with Sautéed Wild Mushrooms
Ingredients: 5 tablespoons extra-virgin olive oil , divided, plus extra for drizzling; 1 pound leeks , trimmed, halved lengthwise, sliced thin, and washed and dried thoroughly, divided; 1 pound cremini, chanterelle, shiitake, and/or oyster mushroom , stemmed and cut or torn into 1½-inch pieces; ½ teaspoon table salt , divided; 1 teaspoon minced fresh thyme; 1½ cups steel-cut oats; ½ cup dry white wine; 4½ cups water , plus extra as needed; 3 ounces ricotta salata , shredded (¾ cup), plus extra for serving; ½ cup chopped fresh parsley , plus extra leaves for serving; 1 tablespoon lemon juice