Instant Pot Chicken Stew

Name: Instant Pot Chicken Stew
Prep time: 15 min
Cook time: 15 min
Total time: 30 min
Cuisine: American
Ingredients: 1 ½ pounds chicken (boneless skinless thighs); ¼ cup flour; 2 tablespoons cooking oil (divided); salt and black pepper (to taste); 1 onion (large yellow, cut into chunks); 2 celery ribs (chopped); 2 garlic cloves (minced); 1 pound potato (peeled and diced (about 1 large russet)); 2 medium carrots (peeled and cut in ½ inch slices); 14.5 ounce can diced tomatoes; 2 cups chicken broth; 1 tablespoon balsamic vinegar; 1 sprig fresh rosemary (leaves removed and chopped (about 1 ½ teaspoon) *); 1 teaspoon dried thyme; ½ teaspoon dried marjoram; 2 teaspoons salt; 2 bay leaves; ½ cup frozen peas; 3 tablespoons cornstarch; 1/3 cup water