Preheat oven to 400 degrees F.
Wash hands with soap and water.
Gently rub asparagus under cool running water and trim off hard ends.
Lay asparagus in shallow, flat pan (9" x 13" pan).
Drizzle asparagus with vegetable oil.
Sprinkle with lemon juice, garlic powder, and a pinch of black pepper.
Bake for 12-15 minutes.
Rotate asparagus half-way through cooking for even heating.