Matcha cake with red bean icing

Ingredients

• 40 g plain flour
• 45 g cake flour
• 1/4 teaspoon salt
• 1/2 teaspoon baking soda
• 1.5 teaspoon green tea (matcha) powder
• 60 g sugar
• 80 ml oil
• 80 ml plain yoghurt
• 1/2 teaspoon vanilla extract
• 1 egg

Red Bean Icing:

• 100 g dried red beans
• water
• About 6 tbs icing sugar