First Step: Prep your bakeware and oven. Preheat the oven to 350°F (175°C). Grease or spray a 9×13-inch baking pan, or prepare an ungreased pan if preferred for desired crust texture. This warms the oven to the correct temperature for even baking, ensuring your cake develops the perfect rise and golden top.

Second Step: Mix your dry ingredients. In a medium bowl, whisk together the all-purpose flour, baking powder, and salt. This evenly distributes leavening and seasoning, preventing clumping and ensuring a uniform cake crumb.

Third Step: Beat yolks and sugar. Separate 5 to 6 large eggs, placing yolks in one bowl and whites in another. Beat the yolks with 3/4 cup (150 g) granulated sugar and 1 to 2 teaspoons vanilla extract on high speed until thick and pale yellow, about 3-5 minutes. This step adds volume and richness essential for the tender cake base. Gently stir in 1/3 cup (80 ml) whole milk to combine.

Fourth Step: Combine dry and wet ingredients. Gradually fold the yolk mixture into the dry ingredients, stirring gently to avoid deflating the mixture. Mixing carefully preserves air pockets that make the cake light rather than dense.

Fifth Step: Whip egg whites. Beat the egg whites with the remaining 1/4 cup (50 g) sugar and optional 1/2 teaspoon cream of tartar until stiff peaks form. This aerated texture is crucial for the sponge’s light, fluffy quality.

Sixth Step: Fold whites into batter. Carefully fold the whipped egg whites into the batter until no streaks remain. This maintains the airiness that helps the cake stay tender but sturdy enough to absorb the milk soak.

Seventh Step: Bake the cake. Pour the batter evenly into the prepared pan. Bake for 25 to 40 minutes, depending on your oven and pan. Check doneness with a toothpick inserted in the center; it should come out clean. Baking too long can dry the cake, while too short results in undercooked batter.

Eighth Step: Cool before soaking. Remove the cake from the oven and cool completely on a wire rack. This prevents the milk soak from melting the whipped cream later and helps the flavors meld.

Ninth Step: Prepare and apply the milk mixture. Combine a 12-ounce (340 g) can evaporated milk, 14-ounce (397 g) can sweetened condensed milk, and 1/4 to 1 cup (60–240 ml) whole milk or heavy cream in a bowl. For a spiced orange version, gently warm this mixture with orange zest and spices like cinnamon, nutmeg, and cloves, then cool. Poke holes all over the cooled cake using a fork or skewer to maximize milk absorption. Slowly pour the milk mixture evenly over the cake edges and top to avoid sogginess.

Tenth Step: Refrigerate and top. Refrigerate the cake for at least 1 hour, or preferably overnight, letting the milk soak fully penetrate. Whip 1 to 2 cups (240–475 ml) heavy cream with 3 tablespoons to 1/2 cup (40–65 g) sugar and 1/2 to 1 teaspoon vanilla extract until soft to stiff peaks form. Spread whipped cream over the soaked cake evenly. Sprinkle with ground cinnamon optionally for a classic finish.

Final Step: Serve and enjoy. Serve the tres leches cake chilled, optionally garnished with fresh strawberries for a bright and fresh contrast. Store leftovers covered in the refrigerator for 3 to 5 days. You can also freeze the cake after baking and cooling (before soaking) for convenience, thawing before soaking to keep the perfect texture intact.