375 ml (11/2 cups) unbleached all-purpose flour

5 ml (1 tsp) baking powder

2.5 ml (1/2 tsp) baking soda

125 ml (1/2 cup) unsalted butter, softened

180 ml (3/4 cup) sugar

1 egg

2 egg whites

125 ml (1/2 cup) buttermilk

With the rack in the middle position, preheat the oven to 180 °C (350 °F). Butter and line a 20 cm (8-inch) springform pan with parchment paper. Place on a baking sheet.

In a bowl, combine the flour, baking powder and baking soda. Set aside.

In another bowl, cream the butter and sugar with an electric mixer. Add the egg and egg whites, one at a time, and beat until the batter is smooth. At low speed, add the dry ingredients alternately with the buttermilk. Set aside.

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