Beat the soft butter with the sugar and vanilla extract until light and fluffy. Use a stand mixer with a paddle attachment or a handheld mixer.

Mix in the egg until fully combined.

Mix the flour with the baking powder and add to the batter. Mix until you form a crumbly dough. If it’s easier for you, finish mixing with a spatula.

Scoop out the dough and make balls with it. Place them separately on a tray lined with parchment paper. For this step, use a small ice cream scoop or a tablespoon.

Press each ball twice with your index finger at an angle to form a heart.

For the filling, if the jam has pieces of fruit, blend it with a couple of pulses to break up the fruit, or pass it through a strainer. Fill a piping bag with the jam and cut a small tip. Fill the hearts with strawberry jam. You might also do this with a teaspoon.

Put the tray in the freezer for half an hour before baking.

Bake in a preheated oven at 350°F (180°C) for 12-14 minutes or until the bases are lightly golden. Let cool before serving.