Set the oven temperature to 350°F /180°C (160°C fan) five minutes before putting the cake into the oven.
Line the cake pans with parchment paper. (I used six 4 inch (10cm) round mini pans) - see notes below or in post above for alternate baking pan sizes)
Stir the Chai tea bags in hot milk.
Leave to brew for 10 minutes, before discarding the tea bags.
Flour mixture: Whisk together the flour, baking soda, baking powder, salt and cinnamon.
Egg mixture: In a separate bowl, combine the eggs, plain unflavored yogurt, sugar, vanilla extract and oil.
Pour the egg mixture into the flour mixture.
Mix until just combined or until there are no visible specks of flour in the batter.
Add the tea together with the shredded carrots, and nuts (if using) to the batter.
Fold in so they’re distributed evenly.
Divide the batter evenly into the prepared baking pans.
Bake for about 25 to 30 minutes, or until a skewer inserted comes out clean.
Leave in the pan for 10 minutes, before turning out on to a rack to cool completely before frosting.