Easy Shepherd's Pie

Name: Easy Shepherd's Pie
Prep time: 15 min
Cook time: 50 min
Total time: 65 min
Yield: 4
Ingredients: 1 teaspoon salt, plus more to taste; 3 large (1 1/2 to 2 pounds) potatoes , peeled and quartered; 8 tablespoons (1 stick) butter, divided; 1 medium onion, chopped (about 1 1/2 cups); 1 to 2 cups mixed vegetables, such as diced carrots, corn, or peas; 1 1/2 pounds ground round beef; 1/2 cup beef broth; 1 teaspoon Worcestershire sauce; Pepper and/or other seasonings of choice