Pre heat oven to 180℃ and line a baking tray with baking paper.
Slice the sweet potato into even ½ inch thick slices.
Place slices on the tray and coat with the oil. Sprinkle over the salt and paprika.
Bake for approximately 30 minutes, until cooked but firm.
Remove the crostini from the oven when cooked and allow to cool.
While the crostini are cooking, chop and dice the avocado, tomatoes & onion.
Combine in a bowl with the oil and herbs.
Top the crostini with salsa just prior to serving.
Notes
You can bake the crostini base and prepare the topping ahead of time if necessary.Keep them separately in the fridge until you're ready to assemble them.