In a mixing bowl, combine 100ml warm water and 25ml milk. Add 2.5g yeast, 15g sugar, 2.5g salt, and 2g baking powder. Mix well until dissolved.
Stir in 10g cooking oil and 8g melted butter. Then, add the 30g glutinous rice flour and 150g bread flour.
Knead the dough for about 5 minutes. The dough will be sticky! That is normal. Don't add extra flour, or it will become tough.
Ferment The Dough
Cover the bowl with plastic wrap or a warm towel. Let it rise in a warm place for 1 hour until it doubles in size. (If your kitchen is cold, put it in the oven with just the light turned on).
Make The Brown Sugar Filling
While the dough rises, mix 25g brown sugar, 2g cinnamon, 4g flour, and 15g chopped nuts in a small bowl. Mix well.
Shape The Hotteok
Rub cooking oil generously on your hands (this is essential!). Divide the fermented dough into 4-5 equal portions. Flatten each portion into round discs.
Add the filling (either brown sugar filling or 1.5 tsp Nutella)
Seal the edges.
Cook The Hotteok
Heat a generous amount of oil in a frying pan over medium-low heat.
Add the hotteok to the pan and gently press down with a spatula.
Cook until golden brown and crisp, turning occasionally to ensure even cooking.
Remove the hotteok from the pan when they are golden brown.
Enjoy while its warm! Jal meokgetseumnida! (Bon appetit!)
Warning: The brown sugar syrup inside gets incredibly hot, like molten lava! Please wait 1-2 minutes after frying before you take that first bite, or you will burn your tongue!