Preheat oven to 450 degrees F.
Place potato in a medium saucepan; cover with water. Bring to a boil. Reduce heat, and simmer 10 minutes or until potatoes are fork tender; drain. Return potato to pan. Add buttermilk, sour cream and butter to pan; mash with a potato masher until smooth.
8 oz cubed peeled Yukon Gold potatoes, 1/2 cup buttermilk, 1/2 cup sour cream, 2 tbsps butter, cut into cubes
In a large bowl, combine flour, baking powder, baking soda and salt. Add potato mixture and stir just until moist. (Do not over stir here!) Turn the dough onto a slightly floured surface; knead lightly about 5 or 6 times, again not very much.
1-3/4 cups all-purpose flour, 1 tbsp baking powder, 1/2 tsp baking soda, 1 tsp table salt
Pat dough to a 3/4-inch thickness. Cut with a 2-inch biscuit cutter. (You can use a larger cutter if you like.) Place biscuits 2-inches apart on a baking sheet coated with cooking spray, covered in parchment paper or fitted with a silicone mat.
cooking spray
Bake for 14 minutes or until lightly browned.
Serve warm smothered in butter, jam and/or honey.