1 1/2 cups mashed potatoes
1 cup cheddar cheese, grated
3/4 cup whole milk
1/2 cup cooked peas
1 egg
6 tablespoons cold unsalted butter, cut into cubes, plus 2 tablespoons, melted
2 tablespoons sugar
1 1/2 tablespoons baking powder
3/4 teaspoon salt
Preheat oven to 450º F. In a large bowl, combine flour, baking powder, sugar and salt and whisk together. Using a pastry cutter or two forks, cut in cubed butter until mixture resembles coarse pebbles. Mix in mashed potatoes, cheese and peas until fully incorporated. In a separate bowl, whisk together milk and egg. Pour into mashed potato mixture and knead until dough comes together. Roll dough out on a lightly floured surface and knead until smooth. Then roll out to 3/4-inch thickness. Use a cookie cutter to cut out biscuits, then transfer to a large baking sheet. Brush tops of biscuits with melted butter, then bake for 15-17 minutes, or until puffed up and golden brown.