Preheat oven to 425 degrees Fahrenheit.
In a large bowl, add ground flax seeds and warm water. Let sit for 3 minutes. Add in chickpeas and mash with potato masher. Add in oat flour, quinoa and spices. Mix to combine.
Form into 4 burger patties and add into parchment lined baking sheet. Bake for 15 minutes.
In a small bowl, add vegan butter, sriracha, orange juice, olive oil and spices. Stir to combine. Add a splash of cold water to help sauce come together.
Arrange burgers with sauce on the bottom bun, arugula, burger, purple cabbage and top bun.