Egg whites cake

Would you like to use your leftover egg-whites preparing a cake? Then try this simple and flavoured recipe.
INGREDIENTS

- 250 g Pastry Flour
- 180 g Soft Butter
- 130 g White Sugar
- 5 Egg Whites
- 1 Baking Powder Sachet
- 2  Oranges or lemons
- 2 Spoons Icing Sugar
- 1 Pinch Salt

HOW TO PREPARE,

Put sugar and oranges or lemon  zest in the mixing bowl while the knives are moving. 15 Sec. Speed 7-8.

Add butter. 30 Sec. Speed 4.

Put salt and flour. 40 Sec. Speed 4.

Add egg whites. 30 Sec. Speed 4.

Add baking powder. 30 Sec. Speed 4.

Butter and cover with flour a 24 cm baking pan and cook in oven. 30-35 Min. 160°C (fan assisted oven) or 180°C (static oven)

Once cooked, let it cool and dress with icing sugar.