In a large mixing bowl, whisk together the einkorn flour, baking powder, and salt until evenly combined.
Add the sourdough discard, honey, Greek yogurt, olive oil, and warm water. Stir until a soft dough forms.
Transfer the dough to a lightly floured surface and knead for 2–3 minutes, until smooth and slightly tacky but not sticky.
Cover the dough and let it rest at room temperature for 20–30 minutes to relax the gluten and make it easier to roll.
Divide the dough into 8 equal portions and roll each piece into a ball. Flatten each ball into a thin round, about ¼-inch thick.
Heat a cast iron skillet over medium heat. Place one flatbread in the dry skillet and cook for 1–2 minutes per side, until golden spots form and the flatbread is cooked through.
Remove from the skillet and immediately brush with melted butter. Repeat with the remaining dough and serve warm.