Preheat the oven to 375 degrees F. Grease four spots in a muffin tin.
Prepare the dough: Mix together the flour, sweetpotato, and Greek yogurt in a medium mixing bowl. Stir together until a shaggy dough forms, then knead by hand for a few minutes until the dough forms a ball that is not sticky and workable.
Pour dough out on a floured work surface, and sprinkle a little more flour on top. Roll the dough into a large rectangle, about 8-10 inches long by 14 inches wide, cutting the edges of the dough if needed to form a clean rectangle shape.
Cut the rectangle into four strips, each about 2 to 2 ½ inches long by 14 inches wide.
Place the cheese over the strips of the dough. Drizzle a line of pizza sauce along the center of the strips, being careful not to use too much sauce. You should use about half of the pizza sauce here; reserve the rest for dipping after cooking.
Place about 8 to 10 pepperoni along the long edge of the strip of dough so that the rounded edge of the pepperoni is slightly overlapping the edge of the dough.
Start from the top and carefully roll the dough down to the end. Place this in the greased muffin tin (with the pepperoni edge face up) and repeat with the other strips of dough.
Bake the pizza roses at 375 degrees F for 16 to 20 minutes, or until the dough is fully cooked through and turning golden brown on the edges. Let cool in the pan for 5-10 minutes, then carefully remove and serve with the remaining pizza sauce for dipping.