Follow these simple steps to create your Masala Chai Tres Leches:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9×13 inch baking pan.
2. Mix Dry Ingredients: In a bowl, whisk together the flour, baking powder, baking soda, and salt until combined.
3. Cream Butter and Sugar: In a separate bowl, beat together the softened butter and granulated sugar until light and fluffy.
4. Add Eggs and Flavorings: Add the eggs one at a time, mixing well after each addition, then blend in the vanilla extract and chai masala spice mix.
5. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, alternating with the milk. Mix until just combined.
6. Pour Batter: Pour the batter into the prepared baking dish and spread it evenly.
7. Bake: Bake in the preheated oven for 25 to 30 minutes, or until a toothpick inserted in the center comes out clean. Allow the cake to cool completely in the pan.
8. Prepare Milks: In a mixing bowl, whisk together the sweetened condensed milk, evaporated milk, and heavy cream until smooth.
9. Soak Cake: Once the cake is cool, poke holes all over the top using a fork or skewer. Slowly pour the milk mixture over the cake, ensuring it seeps into the holes thoroughly.
10. Chill: Cover the cake with plastic wrap and refrigerate for at least one hour or overnight for best results.
11. Garnish and Serve: Before serving, whip some heavy cream to soft peaks and spread it over the top of the soaked cake. Dust with ground cinnamon and cardamom for garnish.