Preheat oven to 400 degrees F. 

Drain and rinse chickpeas. Place them on a baking sheet. Use a paper towel to pat them dry. 

Dice the sweet potatoes and place them on the same baking sheet. 

Drizzle over the olive oil, onion powder, garlic powder and chili powder. Mix to combine and bake for 25 minutes. 

To make the dressing, start by putting the olive oil into a small bowl. Whisk continuously while adding in the remaining dressing ingredients. If you need to thin out the dressing, add a small amount of warm water. 

Remove the sweet potatoes and chickpeas from the oven, dice the avocado, plate the salad and enjoy!