Preheat your oven to 356°F (180°C).
In a large bowl mix the flours with the salt, oregano and baking powder. Add the milk and the olive oil and stir with a fork until the dough comes together. Dust your work surface with flour and transfer the dough there. You don’t have to knead it, just roll out into a circle about 15 inches (38 cm) in diameter. If it’s sticky, dust with more flour.
Transfer the dough to a greased pan. Mix the tomato paste with water and pepper and spread it onto the dough. Top with feta cheese and the rest of the ingredients except the oregano.
Bake at the lower shelf of your oven for 20-30 minutes, until vegetables are caramelized. Sprinkle with oregano and eat!