Another question about biscuits

I used Nuttella and peanut butter,not tohether though.
Lemon curd would work too,but not a cheap jar.

I have used a simple buttercream filling in the past.

I made some with the Tesco recipe during lockdown last Spring. In a fit of boredom, I was looking for something different to bake with ingredients that I didn't need to go shopping for. From memory, I think they were ok but maybe a little too sweet for my taste.

That's brilliant - thank you! The secret is custard powder. It seems odd that it doesn't get cooked. I'll let you know if it works.

Have you seen this recipe from Tesco?

realfood.tesco.com/recipes/homemade-custard-creams.html

Doesn’t use cream and tastes lovely