To make your own Tres Leches Cake, follow these straightforward steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C). Grease a 9×13-inch baking dish.
2. Mix Dry Ingredients: In a medium bowl, whisk together the flour, baking powder, and salt. Set aside.
3. Beat Eggs and Sugar: In a large mixing bowl, beat the eggs and granulated sugar with an electric mixer until pale and fluffy.
4. Add Vanilla: Mix in the vanilla extract.
5. Combine Mixtures: Gradually add the flour mixture to the egg mixture, alternating with the milk. Mix until just combined.
6. Bake Cake: Pour the batter into the prepared baking dish. Bake for 30 minutes or until a toothpick inserted in the center comes out clean.
7. Cool: Allow the cake to cool completely in the pan.
8. Prepare Tres Leches Mixture: In a separate bowl, whisk together the sweetened condensed milk, evaporated milk, and whole milk.
9. Soak Cake: Poke holes all over the cooled cake with a fork. Slowly pour the milk mixture evenly over the cake, ensuring it is saturated.
10. Chill: Cover the cake and refrigerate for at least 2 hours, preferably overnight.
11. Whip Cream: In a mixing bowl, whip the heavy cream with powdered sugar until stiff peaks form.
12. Frost the Cake: Spread the whipped cream over the top of the cake.
13. Garnish: Add fresh fruit and a sprinkling of cinnamon if desired.
14. Serve: Slice and serve chilled.

These simple steps will guide you in creating a delightful Tres Leches Cake that is sure to impress.