Love Food Hate Waste

Ingredients

• 1 cup cooled mashed potatoes, about 235g
• 1 egg
• 250g sour cream
• 3 cups flour
• 115g butter, cubed
• 3 teaspoons baking powder
• ½ teaspoon salt
• Pepper, to taste
• ½ cup cheese, grated (about 75g)