Wash asparagus then snap off the ends using your fingers to remove the woody part of the vegetable.Arrange asparagus in a single layer on a large cookie sheet.
In a small bowl, mix oil, lemon juice and zest, poppy seeds, garlic powder, salt, and pepper. Brush lemon poppy seed mixture onto asparagus with a marinade brush.
Bake until tender, but still crisp 8-10 minutes for thin asparagus, 10-15 minutes for thick asparagus. Serve hot.
Store leftovers in an airtight container in the refrigerator for 4-5 days.