Sprinkle wings with the garlic powder and onion powder. Place metal trivet inside pressure cooker and add one cup of water. Arrange seasoned wings on top of the trivet before securing the cover in place.
Cook on high pressure for 8 minutes.
In a medium bowl, combine pepper sauce, butter and garlic powder. Set aside
Allow pressure to naturally release on the wings for 10 minutes, then do a quick release for any remaining steam.
Place wings to a large bowl. Set aside until just cool enough to handle.
Position top oven rack in the top position and pre-heat broiler to high. Line a large, rimmed baking sheet with aluminum foil and place a wire cooling rack on top.
Pour ½ of the sauce over the wings and toss to coat. Transfer the wings to the wire rack on the prepared baking sheet and place under the broiler for 3-4 minutes or until the wings start to get crispy and develop some color. Turn the wings and broil another 3-4 minutes.
Remove baking sheet from oven and toss the wings with the remaining buffalo sauce. Serve immediately with sliced celery and blue cheese dressing.