Toss the potatoes with olive oil, salt, pepper and garlic powder.
Place the potato wedges in a single layer on a parchment lined baking sheet.
Bake at 400°F for 40 minutes turning after 20 minutes.
Push the wedges closer together, into a small pile.
Sprinkle grated cheese on the potato wedges.
Return them to the oven for a few minutes until the cheese is melts.
For the sauce, blend the avocado with Greek yogurt, lime juice and a pinch of salt.
Spoon the avocado sauce and some green onions over the potatoes and enjoy.