On a floured surface, roll out the chilled galette dough into a circle, about 12-14 inches in diameter.
Transfer the rolled dough to a parchment-lined baking sheet.
Spread the vegan feta mixture in the center of the dough, leaving about a 2-inch border.
Arrange the sautéed zucchini, corn, and sliced tomatoes or halved cherry tomatoes on top of the vegan feta.
Fold the edges of the dough over the filling, pleating as you go around.
Brush the edges of the galette with non-dairy milk for a golden crust.
Bake in the preheated oven for 30-35 minutes, or until the crust is golden brown.
Once baked, let the galette cool slightly before slicing. Garnish with fresh basil leaves.
Serve warm and enjoy your Vegan Tomato Corn Zucchini Galette with Vegan Feta!