Ingredients

• Homemade Creamy Mashed Potato Topping
• 5 pounds Russet potatoes
  
• ¹/₂ cup butter, cut into thick slices
  
• 8 ounces sour cream
  
• 4 pieces garlic cloves, minced
  
• 2 teaspoons salt
  
• 1 teaspoon black pepper
  

• Shepherd's Pie Filling
• 2 tablespoons olive oil
  
• 1 piece large white onion, chopped
  
• 3 pieces garlic cloves, minced
  
• 16 ounces boneless, skinless chicken breasts (cut into ½ inch cubes)
  
• 2 tablespoons Worcestershire sauce (gluten-free)
  
• 2 tablespoons tomato paste
  
• 1 ¹/₂ cups chicken stock (gluten-free)
  
• 2 cups fresh (or frozen) broccoli, cut into ½ inch pieces
  
• 1 cup frozen green peas
  
• 1 cup shredded cheddar cheese