The Closest Thing to a Weeknight Shepherd's Pie recipe You'll Find

Ingredients

• 4 russet potatoes
• 1 tablespoon neutral oil, such as canola or grapeseed
• 1 medium onion, chopped (about 1 cup)
• 1 1/2 teaspoon salt, divided, plus more to taste
• 2 lbs ground beef
• 1 tablespoon onion powder
• 1 1/2 teaspoon garlic powder
• 1 teaspoon fresh thyme, optional
• 1 10-ounce bag frozen mixed vegetables (we like peas and carrots or carrots, green beans, corn and peas)
• 1/2 cup broth, chicken or beef (you can substitute water in a pinch)
• 1/3 cup ketchup
• 2 teaspoons Worcestershire sauce
• 1 cup milk
• 4 tablespoons unsalted butter
• 1/4 cup grated Parmesan or cheddar cheese
• Ground black pepper