Preheat the oven to 375º, and line a sheet tray with parchment paper.

In a food processor measure together the flour, baking powder, sugar, salt and pepper.

Add the cold butter, and pulse until the butter is in small pieces throughout the flour mixture.

Add the mashed sweet potatoes and cheese, and process just until the dough comes together. Be careful not to overwork the dough.

Transfer the dough to a lightly-floured surface, and using your hands press into a 1-inch-thick square.

Cut the dough into either circles or squares, and place on the prepared sheet tray.

Bake until they are golden brown, 20 to 25 minutes.

Allow to cool a bit before serving.

Note: 

To roast sweet potatoes, preheat your oven to 350º. Lay your sweet potatoes on a parchment-lined sheet tray, and bake until they are knife tender, about 45 minutes. Allow to cool. Remove the skin and place the potatoes in a bowl. Using a potato masher, mash the potatoes until no lumps remain.