Preheat the oven to 350?F (175?C). Grease and flour a 9x13 inch baking dish.

In a mixing bowl, whisk together flour, baking powder, and salt.

In another bowl, beat the butter and sugar until light and fluffy. Add eggs one at a time, mixing well after each addition. Stir in vanilla.

Gradually add the dry ingredients to the wet ingredients, mixing until just combined.

Pour the batter into the prepared baking dish and bake for 30 minutes or until a toothpick comes out clean.

In a bowl, combine evaporated milk, sweetened condensed milk, and whole milk.

Once the cake is baked, let it cool for 10 minutes. Poke holes all over the cake with a fork.

Slowly pour the milk mixture over the cake, allowing it to soak in.

In a mixing bowl, beat the heavy cream, sugar, and vanilla until soft peaks form.

Spread the whipped cream over the soaked cake and sprinkle with ground cinnamon.

Chill the cake in the refrigerator for at least 2 hours before serving.

Slice and enjoy your Tres Leches Cake!