Matzo Gnocchi Soup

Name: Matzo Gnocchi Soup
Ingredients: 1 large kosher chicken; 3 large carrots, peeled, cut into 1-inch pieces; 1 head of celery, stalks cut into 1-inch pieces, leaves set aside; 3 large leeks, cut into 1-inch pieces; 1 head of garlic, halved crosswise; 2 tablespoons whole black peppercorns; 1 fresh bay leaf; 1 bunch fresh thyme; Kosher salt; 1 large (11–12-ounce) russet potato; 1 /4 cup matzo meal; 1 tablespoon finely minced fresh chives; 1 tablespoon finely minced flat-leaf parsley; of freshly ground nutmeg; 3 large egg yolks, beaten to blend; Freshly ground black pepper; Extra-virgin olive oil (for drizzling)