Pour the extra virgin olive oil into a large skillet and saute the onions for about 10-15 minutes on medium heat or until golden brown and caramelized. Turn your stove to medium-low heat if your onions are cooking too fast or starting to burn.
About halfway through cooking add 1/4 tsp salt, 1/2 tsp garlic powder, and 1/4 tsp black pepper and stir. Finish cooking the onions and set aside to cool.
In a medium bowl, mix together the plain Greek yogurt, mayonnaise, and the remaining 1/2 tsp of salt.
Add the onions to the yogurt mixture and stir to combine.
Refrigerate before serving. Enjoy!