What's the best kind of pumpkin to use for the cream cheese stuffed pumpkin bars?

I always recommend using Li b by 100% pure pumpkin for any of my pumpkin treats! I think Libby has the best color, taste and texture. Also be sure you’re using pumpkin puree (where the only ingredient is pumpkin) not pumpkin pie filling.

Can I use light butter for the crumble?

Do not use light butter/margarine in place of real butter for the crumble. I have tried and it will not work!

Can I use coconut flour instead of all-purpose flour?

You can but coconut flour is much more absorbent than other flours. Since it is more absorbent, you would have to 3-4x the amount if you wanted to replace with another flour.