Fold in half both ways. Then unfold.
Fold in half from corner to corner, both ways. Then unfold.
Collapse the right and left side into a triangle. Sometimes this is called a waterbomb base.
Fold the upper layer of each side toward the pointed center.
Flip the entire shape over.
Fold the bottom point to the top edge, enough that it goes past the top edge.
Fold the top point over the edge.
Flip the entire shape back over and fold in the center.
Gently bend the wings out and away.
Enjoy your 3D origami butterfly!