Mum's Cottage Pie

Ingredients (12)

• ✓ 2 large potatoes, peeled and diced
• + 2 tablespoons milk add to pantry
• + 1 tablespoon butter add to pantry
• + salt and ground black pepper to taste add to pantry
• ✓ salt and ground black pepper to taste
• + 1 tablespoon vegetable oil, or as needed add to pantry
• + 1 large onion, diced add to pantry
• + ½ pound lean ground beef add to pantry
• + ⅓ cup dry sherry add to pantry
• + 1 dash Worcestershire sauce add to pantry
• + 1 ½ teaspoons all-purpose flour add to pantry
• + ½ cup grated Parmesan cheese add to pantry