Preheat oven: Precaliente el horno a 180°C and lightly grease a baking tray.
Make the dough: In a bowl mix flour, baking powder, salt, and sugar. Rub the butter into the flour until crumbly.
Add milk: Gradually add milk and mix until a soft dough forms.
Roll out dough: On a lightly floured surface, roll the dough into a rectangle about ½ cm thick.
Add guava jam: Spread guava jam evenly across the dough.
Roll and slice: Roll the dough tightly into a log and cut into 12 slices.
Bake: Place slices on the baking tray and bake for 20–25 minutes until golden.
Optional glaze: Mix icing sugar with a little water or milk and drizzle over warm rolls.