Step 1

Grease a small baking dish or quarter sheet pan with butter and dust all over with flour, shaking off any excess flour.

Step 2

Set rack in the middle of the oven and preheat at 400°F.

Step 3

Place the grated potatoes in a strainer and press out as much moisture as you can — repeat a couple times until almost dry. In a medium bowl, mix the strained potatoes, onion, flour, eggs, salt, pepper, and baking powder very well.

Step 4

Press the potato mixture into the prepared baking dish. Brush olive oil generously over the top.

Step 5

Place in the oven and bake until completely cooked and golden brown on top and bottom, about 40 to 45 minutes.