In a small pot melt the vegan margarine. Pour it into a large bowl and add agave, vanilla, and lemon juice, and combine.
Then add rice flour, oat flour, cornstarch, baking powder, and a pinch of salt. Create a smooth dough, that will be sticky. Put it into the fridge for about 1 hour before the next step.
After 1 hour, roll the dough thinly and cut out cookies. Put them carefully on parchment paper and bake them for about 8 minutes at 400F (200ÂșC).
When the cookies are done, cool them down and fill them with strawberry jam. These cookies are best eaten the next day when the cookies will soften. Enjoy!