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Portuguese Orange Cake

Prep Time 20 mins
Cook Time 40 mins
Servings 9
Dessert
Portuguese

Ingredients
  

  • 2/3 cup 150 grams butter, softened
  • 1 1/4 cups 250 grams granulated sugar
  • 4 large eggs separated, room temperature
  • 3 large oranges room temperature
  • 2 cups 9 oz/250 grams all purpose flour
  • 1 tsp baking powder
  • Confectioners' sugar for dusting (optional)

Instructions
 

  • Preheat oven to 350ºF (180ºC). Grease an 8x8" baking dish or line with parchment paper.
  • Beat butter and sugar on medium speed of electric mixer until light and fluffy, about 2 minutes. Add egg yolks, one at a time, beating well after each. With mixer on low speed, add the zest and juice from all three oranges. The mixture will appear curdled at first - that's ok. Increase mixer speed to medium and beat until it comes together, pausing to scrape down sides of bowl as needed.
  • In a separate bowl, whisk flour and baking powder. With mixer speed on low, gradually beat into the butter mixture until just incorporated.
  • In another bowl, whip egg whites until stiff peaks form. Fold 1/3 of the whites into the cake batter to lighten it up, then gently fold in the rest. (Use a light hand so you don't deflate the whites.) Scrape batter into prepared baking pan and bake for 35-45 minutes, until top feels springy when gently pressed and tester inserted in centre comes out clean or with just a few moist crumbs.