Defined brownies/Brookies

[abeanbaked]

I see so much of this online. Amazing brownies with fillings that don't seem to melt in the oven. Whenever I stuff mine they seem to melt, this includes when i freeze things like galaxy caramel and rolos. How can I get bakes that look like these!?

I can't help much as I have never made a similar bake, but I have the below recipe by John Whaite on my list to make, and all his recipes I have tried before have worked.

Rolo Brownies