Wha are your guys favorite fillings that aren’t too sweet? I’d love to hear them

Hi guys i’m new here, i’ve tried making macarons a few times but they come out hollow and super crunchy and hard instead of chewy any tips?

Okay this is my fifth time trying macaroons but my first time using your recipe. And I'm not going to lie your recipe intrigued me because it only uses the mixer but also dumping raw egg whites into my meringue was a crazy thought. The first tray almost perfect! Slightly lopsided on the back side of the tray that was like deepest in my oven. So I decided for the second batch to rotate the tray halfway through. And as soon as I rotated the tray and set it back down every one of them cracked 😭 I also have a convection oven and I forgot to turn my fan off. Overall I'm super happy. And the fact that I can do the macronage with my mixer is crazy!!