Ok the first try I used a boxed cake with the extender and baked at 350° for 50 minutes but the sides were getting overdone.
It is a puffed heart pan by Wilton. I find that if you use just a box it is really thin.
The second try the same but baked about five minutes longer......!
The third try I used 1 and 1/2 boxes of cake mix and dropped the temp to 325° for 65 minutes.
I know I have a lot to learn. I hope to get better in time.