A few months back we had some drywall work done, the problem is we put the drywall directly over the already existing wood paneling. Because I wasn't thinking ahead I now find myself with a problem. Below there are pictures of the situation I am dealing with. Because the drywall is over the paneling it created a 1/2" gap around all of the door jambs.
For the doorways where there isn't actually a door (ex. hallway) I am just going to remove the old jamb and put drywall around the entry way but for spots where there are doors does any one have any suggestions of how I can fix this without it looking bad?
...but those that wait upon the Lord shall renew their strength. -Isaiah 40:31
Get furring strips, rip them down and bring them out to the edge of the drywall then your casings will cover it. Sand the frame of the door and newly added strips, paint and it should look fine. Good Luck
Like others said, either rip your own or buy 1/2"x3/4" parting bead. Your jamb appears to be slightly rounded on the edge, I would install it with a reveal instead of flush. This way, you will not need to fill and sand the joint. Just use your old casing paint line as a guide for your reveal.