Preheat oven to 200°C (390°F) and arrange the baking tray onto the middle shelf.
Thinly slice the potatoes using a mandolin or sharp knife.
In a bowl, mix the flour, salt, and grated Parmesan cheese. Gradually add the water, a little at a time, until you get a smooth, thick batter. Adjust water as needed based on your flour.
Stir in 1 tablespoon of extra-virgin olive oil, then fold in half the potatoes and the fresh rosemary.
Grease a baking pan (13x9 inch), line it with parchment paper to keep it in place, then brush it with 1 tablespoon of extra-virgin olive oil.
Spread the batter evenly, top with the remaining potatoes, drizzle with the remaining 1 tablespoon of extra-virgin olive oil, and season with salt and pepper to taste.
Bake for 30-40 minutes or until golden and crispy. Slice and enjoy!
Notes
Please note that all my baking recipes are tested with grams measurements, which are more accurate than cup measurements. US cup amounts are provided, but for best results always use a scale when measuring ingredients.I use a 13x9 inch (35cm x 23 cm) baking sheet, but the recipe works well with a slightly bigger sheet too, if you use a small baking pan, you might need to bake it a little longer.
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The information shown is an estimate provided by an online nutrition calculator. It should not be considered a substitute for a professional nutritionist’s advice.