Heat your oven to 350°F (175°C) and prepare a baking tray with parchment paper.
Combine all ingredients in a high-speed blender and process until completely smooth.
Transfer the mixture onto the prepared baking sheet and spread evenly into a roughly 20×25 cm (8×10 inches) rectangle, being careful not to make it too thin.
Place the sheet in the oven and bake for around 40 minutes, watching closely to prevent over-browning or crisping. If bubbles appear, gently pierce them with a fork.
When the flatbread is fully cooked but still flexible, remove it from the oven and allow it to cool briefly.
Turn the flatbread over so the parchment is on top and carefully peel the paper away starting at the corners, using a spatula to lift any sticking areas.
Let it cool further before rolling, filling, or slicing as you like.
For best taste and texture, serve fresh; refrigerate tightly wrapped for up to two days if needed, avoiding moist fillings which can cause sogginess.