Let the yeast rise in 5 tablespoons of lukewarm soy milk for 15-20 minutes. Mash the bananas into a pulp in a bowl with a fork. Put the flour in a bowl, make a well in the middle. Add the yeast, banana mash, agave syrup, margarine, soy milk, apple juice, vanilla and salt. Mix everything together and knead into a smooth dough. Cover and let rise in a warm place for 30 minutes.
Roll out the dough in portions on a surface dusted with plenty of flour and cut into triangles. Spread a thin layer of agave syrup over the triangles and roll up into croissants starting at the broad end. Bake in the oven at 200 ° C for approx. 20 minutes until golden brown. Before cooling down, brush the outside with agave syrup, but the croissants will then be very sticky.