Heat the butter over low heat until small bubbles appear, then immediately add the flour while stirring continuously with a whisk. Once smooth, add the condensed milk, and remove from heat. -- Then add the flour mixture to a bowl containing the egg yolks, mix well, and set aside.

Beat the egg whites and sugar until stiff peaks form, then gradually fold into the flour mixture from step 1 using a spatula until well combined and homogeneous :)

Pour into a baking pan lined with parchment paper. I used two mini loaf pans.

Bake using the Bain-Marie method. Place the main pan in a larger pan filled with 1.5 cm of water. Bake at 320°F (160°C) for about 45 minutes or adjust according to your oven.

Tadaa, it's done and successfully cracked... next time when I make it again, I'll follow up with a photo of the smooth one... without any accidents!
Hahaha...

It was very smooth when I took it out of the pan, as smooth as a baby's bottom... so cute, I wanted to pinch it.

Let's cut it... :) I always cut it while it's hot because I'm impatient. Oh, and the cake doesn't shrink... no shrinkage...

Smooth, fragrant, simple, and delicious! No need for baking powder, baking soda, vanilla, etc... because the aroma from the condensed milk is already fragrant, it can mask the egg smell :)

Believe me, the texture is like cotton, it melts in your mouth... hmmm... disappears quickly hahaha...

Condensed milk cotton cake, also known as Sweetened Condensed Milk Cotton Cake ^^

The pores are very tight... love it...

One of the favorite cakes in my house :)

Healthy :)

Hmmm... Highly recommended :)