Heat the oven to180°C/160°C fan/Gas Mark 4. Meanwhile, line a baking tray with a sheet of non-stick baking paper.
Place the baguette slices on the baking tray and drizzle with oil. Bake for about 10 minutes, until crisp. Turn off the oven, then leave inside to cool for around 20 minutes. Remove from oven and allow to cool totally.
Peel and chop the avocados. Top the bread with the avocado slices, feta and basil leaves Drizzle with oil and season to taste with salt and freshly ground pepper before serving.