Best-Ever Shepherd's Pie Soup - A Cozy Dinner Recipe - My Homemade Recipe

Ingredients

• 4 large russet potatoes (900 g), peeled and cut into thirds
• 0.75 teaspoon salt
• 180 ml sour cream
• 450 g ground beef (85% lean)
• 1 yellow onion, diced
• 3 cloves garlic, minced
• 3 tablespoons salted butter, divided
• 30 g plain flour
• 950 ml chicken broth
• 480 ml half and half
• 0.75 teaspoon Worcestershire sauce
• 2 teaspoons Italian seasoning
• 0.5 teaspoon mustard powder
• 0.25 teaspoon ground sage
• 200 g shredded cheddar cheese
• 200 g frozen mixed vegetables
• Salt and pepper to taste