In a mixing bowl, combine cassava flour and salt

Add warm water and oil, and mix with a spoon or hands until a dough forms. Add a splash more water if the dough is too dry

Divide into two equal parts and roll each one into a ball

Using parchment paper, press or roll each ball into a flat circle (about 1/4 inch thick)

Heat a skillet over medium heat and cook each flatbread for 2–3 minutes on each side until lightly golden and pliable

In a small bowl, mash avocado with lime juice and sea salt. Add herbs if using

Spread avocado mash over warm flatbread, top with extras if desired, and serve immediately