Preheat a large cast-iron skillet over medium-high heat.
Using a pizza wheel or kitchen scissors, cut the crust in half, then cut each half in half again to make 4 triangles. Spread the garlic cream, if using, over half of the triangles, followed by the sweet potato. Sprinkle with the vinegar and top with roasted red pepper; season with salt and pepper. Place the remaining triangles on