Shepherd's Pie, Lightened Up

Bahan-bahan (6 porsi)

• 1 -1/2 pounds Yukon Gold potatoes (peeled, diced)
• 3/4 cup chicken broth
• 2 tablespoon reduced-fat sour cream
• salt and pepper
• paprika
• 1 lb 95% lean ground beef
• 1 teaspoon olive oil
• 1 medium onion (diced)
• 1 celery stalk (chopped)
• 2 cloves garlic (diced)
• 8 ounces mushrooms (diced)
• 10 ounces frozen mixed vegetables (carrots, corn, peas, green beans, baby lima beans)
• 2 tablespoons flour (or use GF flour)
• 1 cup fat free beef broth
• 1 tablespoon tomato paste
• 1 teaspoon Worcestershire sauce
• 1 teaspoon freshly rosemary leaves (chopped)
• 1 teaspoon freshly thyme leaves (chopped)
• kosher salt and black pepper (to taste)