Preheat the oven to 180 C for 10 minutes. Grease the baking pan and line it with parchment paper. Keep it aside.
Add flour,3 tablespoons of custard powder, baking powder, baking soda, cardamom powder, and salt in a big mixing bowl. Mix it well with a wire whisk and keep it aside. (note: you can use corn flour instead of custard powder)
Add oil and sugar to a big mixing bowl. Whisk it well.
Add curd and whisk it well until the ingredients are combined well and the mixture looks homogenous.
Add vanilla essence and whisk it well.
Add mango pulp and whisk it well.
Add flour mixture to the mango mixture. Mix it well with a whisk or spatula. Add dry ingredients in 2-3 batches. Do not over-mix the batter.
Add milk and mix it well.
Pour the batter into the greased pan. Spread it evenly. Tap the pan 2-3 times to remove the air bubbles.
Bake it in a preheated oven for 35-40 minutes or until a skewer inserted in the centre comes out clean. (note: every oven works differently, so please keep an eye on the cake and check after 30 minutes for its doneness)
Take the cake out of the oven and let it cool down for 5-10 minutes. Loosen the sides with a knife and demould it on a wire rack. Let it cool down completely.
Slice the cake into the desired shape and size.
Eggless Mango cake is ready to serve. Serve it with your favourite toppings, and enjoy this delectable cake.