Here's one way...
To use it, make sure you've added an event named
click to your input map and associate it with the left-mouse button...
Next, create a separate scene named
sprite that contains your crater sprite.
Finally, create a new 2D scene with the following script attached to the root node:
var sprite = preload("res://sprite.tscn")
var s = sprite.instance()
s.position = get_global_mouse_position()
That will create a new instance of the
sprite scene (your crater sprite) at every position where the mouse is clicked.