Preheat the oven to 425 degrees Fahrenheit. While oven preheats, cut the ends of the asparagus off and wash under cold water.
Pat dry with a towel, and place on a rimmed baking sheet. Drizzle olive oil over the asparagus. Then sprinkle the salt, black pepper, and garlic powder on top. Using your hands, rub the olive oil and seasonings all over each asparagus spear -- making sure every spear is coated.
Place in the oven for 12-15 minutes (depending on the thickness of the spear and how well you want the asparagus cooked). Remove from the oven, and enjoy immediately. Or let cool, and store in the refrigerator for later use.