Hearty Turkey Shepherd's Pie Recipe (Lighter & Delicious!)

Ingredients

• 1 tablespoon olive oil
• 1 large onion, chopped
• 2 carrots, peeled and diced
• 2 celery stalks, diced
• 1 pound ground turkey
• 1 teaspoon dried thyme
• 1/2 teaspoon dried rosemary
• 1/4 teaspoon ground black pepper
• 1/4 teaspoon salt
• 1/4 cup all-purpose flour
• 1 cup beef broth
• 1 cup frozen peas and carrots mix (optional)
• 2 tablespoons tomato paste
• 1 tablespoon Worcestershire sauce
• 2 pounds Yukon Gold potatoes, peeled and quartered
• 1/2 cup milk
• 4 tablespoons unsalted butter
• Salt and pepper to taste