In a mixing bowl, combine 2 cups of mashed potatoes with 1 cup of all-purpose flour, 1/2 teaspoon of baking powder, and 1/2 teaspoon of salt. Gently mix until everything is incorporated into a soft dough.

Lightly flour a clean surface and turn the dough out onto it. Using your hands, flatten the dough into a circular shape, about 1/2 inch thick. Use a knife to cut it into quarters, forming triangles.

Heat a skillet over medium heat and add a generous knob of butter. Once melted, place the potato triangles into the skillet.

Fry for about 6-8 minutes on each side until they are golden brown and crispy.

Remove them from the skillet and place them on a plate lined with paper towels to absorb any excess butter. Serve warm with your choice of toppings or simply with a spread of butter.