Shepherd's Pie, Lightened Up

Ingredients (21)

• Potatoes:
• 1-1/2 lbs Yukon Gold potatoes
• 3/4 cup fat free chicken broth
• 2 tbsp reduced fat sour cream
• salt and pepper
• paprika
• Filling:
• 1 lb 95% lean ground beef
• 1 tsp oil
• 1 medium onion
• 1 celery stalk
• 2 cloves garlic
• 8 oz mushrooms
• 10 oz frozen mixed vegetables
• 2 tbsp flour
• 1 cup fat free beef broth
• 2 tsp tomato paste
• 1 tsp Worcestershire sauce
• 1 tsp freshly chopped rosemary leaves
• 1 tsp freshly chopped thyme leaves
• kosher salt and pepper