to be soft at room temperature
Step by step
In a bowl, beat the soft butter and powdered sugar well with the mixer.
Add the egg whites and mix.
Next comes the vanilla essence and flour - mix well, it is good with the mixer, to be a more uniform composition.
A softer dough will come out, good to pass through a baking sheet.
Place the dough in a pos (preferably with a larger dui) and lightly form the popcorn in a Teflon baked tray.
Make dips with your finger in the middle of each cookie.
Put a little jam in these depressions.
Bake the biscuits in a preheated oven at 200 degrees - 10-15 minutes. Be careful not to brown too much, just to be slightly browned on the edges.
Let it cool and serve with great pleasure :)