Flatbread Pizza

Preheat oven to 400°. In a large bowl, whisk to combine flour, baking powder, salt, and baking soda. Add yogurt and oil and mix until no dry spots remain. Lightly flour a clean work surface. Transfer dough to surface and knead until smooth, 3 to 4 minutes, adding more flour if the dough is sticky.  Divide dough into 3 pieces, then roll each piece into 1/4" thick round. Heat a large skillet or griddle over medium-high heat and add enough vegetable oil to coat the bottom of the pan. Cook flatbreads until golden on both sides, about 2 minutes per side. Continue cooking flatbreads, adding more vegetable oil as needed. In a medium bowl, combine tomatoes, red onion, oil, and oregano and season with salt and pepper. Top each flatbread with cheese, tomato-onion mixture and bake until cheese is melty, 15 minutes. Drizzle with balsamic glaze and top with arugula before serving.