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The day before or at least 2 hours beforehand: place small spoonfuls of spread on a baking sheet lined with parchment paper or on a plate. Place in the freezer (they must be very hard).
In a bowl, cream the softened butter and sugar together. Add the egg, then stir in the flour, baking powder, salt, and chocolate chips.
Take a ball of dough, flatten it in the palm of your hand, place a frozen spread filling in the center, close it with a little dough, then shape it into a nice ball. Place on a baking sheet.
Preheat the oven to 350°F. Bake for 10 to 12 minutes max: the edges should be golden brown, but the center should still be soft. Let cool... and melt.