Stretch dough into a large rectangle and cut in half. Drizzle both halves with olive oil and bake on greased cookie sheet at 450F until golden brown, about 10 minutes. While hot, rub each flatbread with garlic. Top with feta and Parmesan and bake until cheese melts, about 3 minutes. Remove from oven and sprinkle with mint, zest and a few shakes of chili-pepper flakes.