01 -
Mash the salted duck egg yolks in a small bowl until smooth, then add powdered milk and cornstarch. Mash to combine. Add butter, powdered sugar, vanilla, salt (if using), and turmeric (if using). Mix and mash until smooth.
02 -
Whisk eggs thoroughly in a large bowl. Add milk, salt, and vanilla extract. Whisk to combine.
03 -
Cut thick slices of bread almost all the way in half horizontally, leaving one edge attached. Press down on the inside of the bottom piece to create a pocket. Spread a thin layer of sweetened condensed milk around edges as glue to seal the toast. Place 2-3 tablespoons of filling into the bread pocket. Close the bread and press edges gently to seal. Repeat for remaining toasts.
04 -
Heat 1 tablespoon of butter in a nonstick pan over medium heat. Dip a prepared toast into the batter for approximately 20 seconds per side, allowing excess to drip off. Place toast in the pan and cook for about 2 minutes per side, adjusting heat as needed. Transfer to a serving plate when done. Repeat with remaining toasts, adding butter between batches as needed.
05 -
Serve hot immediately with extra butter and sweetened condensed milk. Optionally, place a piece of butter on the hot toast and drizzle with condensed milk before eating.