Preheat oven to 350 degrees F (175 degrees C).
Beat egg whites in a glass, metal, or ceramic bowl until firm, but not stiff.
Combine sugar and butter in a large bowl; beat with an electric mixer on high speed until creamy. Mix in egg yolks until well blended. Mix in Parmesan cheese gradually. Add sour cream and baking powder; beat until batter is smooth.
Sift rice flour over batter; fold in with a spatula. Fold in egg whites with the spatula.
Pour batter into a 9×13-inch glass baking dish. Sprinkle sesame seeds on top.
Bake in the preheated oven until golden brown on top and a toothpick inserted into the center comes out clean, about 38 minutes.
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