Heat the oven to 350 degrees. In a large bowl, use an electric mixer with the whisk attachment to mix the sugar and flour. Drizzle in the butter and mix, to fully incorporate. Slowly add the water and the vanilla while continuing to mix. Scoop a tablespoon of batter onto the baking sheet lightly sprayed with cooking spray. Spread into a 4 to 5 inch circle. Leaving plenty of space between them, repeat with 2 more spoons of batter. Bake for 10 minutes, or until golden all over. Let the baking sheet sit on the counter for 1 minute, then carefully peel each round off the baking sheet by sliding an offset spatula underneath. If the cookie sticks to the spatula, wait another 30 seconds. Drape each round over an overturned glass, gently pressing the sides down to form a bowl shape. Let cool until firm. Repeat in batches with the remaining batter.
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