Preheat oven to 350 degrees, with rack in lower third. Sift flour, 1/2 cup sugar, and salt into a medium bowl; set aside.
Beat egg whites on medium-low speed in the bowl of an electric mixer fitted with the whisk until foamy, about 2 minutes. Mix in cream of tartar and vanilla. Raise speed to medium-high; beat until medium- stiff peaks form. Reduce speed to medium-low; add remaining 1 cup sugar in a steady stream. Beat until stiff (but not dry) peaks form; transfer to a large bowl.
Sift one-third flour mixture over egg-white mixture; gently fold in with a rubber spatula. Repeat to incorporate remaining flour mixture. Gently spoon batter into a large pastry bag without a tip. Pipe batter into 1-cup angel food cake molds so each is 2/3 full.
Bake, rotating molds halfway through, until cakes are pale golden and tops spring back when lightly pressed, 15 minutes. Let cool in molds on wire racks 30 minutes.
Invert molds, and sharply rap them on a towel-covered work surface; gently release cakes from molds. Spoon poured fondant glaze over top of each cake, letting it drip down sides.
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