Put 14 oz unflavored Greek yogurt and 2 eggs in a bowl and beat thoroughly using an electric beater. Add 2 tablespoons of cornstarch and 5.3 oz sugar and beat again.
Put parchment paper in a round mold and pour half of the mixture. Add blackberries or raspberries and pour the other half of mixture. Scatter a few more berries and put in the oven, preheated to 360°F, until brown on the edges and a little bit on top. Dust some powdered sugar on top.
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