Begin by creaming together the vegan butter, vanilla paste and caster sugar for the vanilla cookie dough.
Next add in the plain flour, salt and soy milk and bring together into a shaggy dough.
Knead the dough on a flowered surface until you have a smooth ball.
Flatten the ball into a disc then wrap in clingfilm or place in a Ziploc bag and chill for at least 30 minutes.
In the meantime, make the strawberry dough by again creaming together vegan butter and sugar.
This time, add the flour, freeze dried strawberry powder and soy milk and mix well until you have a shaggy dough.
Now knead the strawberry dough on a floured surface until you have a smooth ball.
Flatten this ball into a disc and wrap it in clingfilm or place in a Ziploc ball and chill for at least 30 minutes.
In the meantim, pre-heat your oven to 180C / 350 F / gas mark 4.
Once both doughs are chilled, roll out the vanilla dough until 1 cm thick.
Roll out the strawberry dough to the same thickness and cut out heart shapes.
Place the hearts on top of the vanilla dough and roll out until the hearts are embedded in the vanilla dough (and roughly 0.5 cm thick).
Cut out heart shapes from this combined dough.
Place the unbaked heart cookies onto a baking tray and bake for 12 - 15 minutes or until the edges are crisp and golden.
Leave to cool on a wire rack then enjoy!