1. Combining the flour, milk powder, sugar, baking powder, and salt together in a large mixing bowl.
2. Gradually add water to the mixture, whisking until a thick dough forms. Add the yeast and mix until completely smooth. Cover the bowl with plastic wrap and let the batter rest for 1 hour.
3. (While you wait) Whisk together the eggs, sugar, and vanilla extract until well incorporated, 2-3 minutes. Set aside.
4. (Once the batter has rested) Uncover your batter and gently fold in the egg mixture. Then, add in the melted butter and baking soda. Mix well to combine.

Cooking martabak manis

1. Heat a nonstick, heavy-bottomed pan over medium-low heat. Lightly spray the pan with cooking oil, spreading it evenly with a brush; wipe away any excess with a paper towel.
2. Pour the batter into the pan, tilting it to make sure that the batter gets around all the edges to form a wide martabak.
3. Once bubbles appear on your Indonesian pancake and start to burst, reduce the heat to low and sprinkle some granulated sugar over top. Cover the pan, and let it cook for 2-3 more minutes until the pancake is fully set.
4. Carefully remove the martabak from the pan and spread melted butter over it. Cut the martabak in half and add the chocolate sprinkles. Drizzle some condensed milk on top for extra sweetness. Finally, sandwich your martabak manis, cut it into pieces. Serve warm and enjoy!