Make the garlic butter by combining the salted butter, garlic powder, parsley, onion powder, and black pepper.
Spread the garlic butter over both sides of the bread slices.
Toast them over medium heat on an electric griddle, for about 5 minutes flipping them halfway through, until golden brown on both sides. Or you can toast them in batches in a skillet on low heat. (See notes for additional methods)
Video
Notes
Air Fryer: Preheat the air fryer to 320˚F. Working in batches, air fry the slices of garlic bread for 6-8 minutes, flipping them over halfway through, until golden brown.Grill: Grill over medium heat for 2-3 minutes, flipping it over every 15 seconds or so until browned.Oven: Preheat the oven to 425˚F. Lay the prepared slices on a parchment-lined, rimmed baking sheet. Bake at 425˚F for 6-9 minutes, flipping them over halfway through baking.