Easy As Pie is an achievement that requires the player to bake an uncooked pie using the Lunar spell Bake Pie which requires the player to be on the Lunar spellbook. The spell can be found in the Skilling tab of the Magic panel and requires 1 astral, 5 fire, and 4 water runes.
Players must have the Cooking level required for the pie that they are trying to bake.