Herby Lemony Chicken Thighs with Potatoes

Name: Herby Lemony Chicken Thighs with Potatoes
Ingredients: 2 pounds bone-in, skin-on chicken thighs (4 to 6); 3/4 teaspoon kosher salt; 1/2 teaspoon freshly ground black pepper; 2 teaspoons dried oregano; 1/4 teaspoon red pepper flakes; 2 tablespoons olive oil; 1 1/2 large lemons, divided; 1 pound baby yellow potatoes or small, golf-ball size Yukon Gold potatoes (8 to 10); 1/2 cup low-sodium chicken or vegetable broth, or water; 2 teaspoons Dijon mustard; 2 teaspoons low-sodium soy sauce or tamari; 4 sprigs fresh parsley; Crusty bread, for serving