Can you cure Plastisol ink in an oven?
Yes it will work. Put the shirt on a cookie sheet and place it in the oven at 450 degrees F (232 degrees C) for 2 minutes.
You will want to use an electric not gas oven, preferable one you do not cook food in as the ink does outgas some.
The time is an estimate and some testing may be required depending on the thickness of the ink and garment type.