I’m not sure what I am doing wrong. I keep ending up with hollow shells.

Today is my third times trying out crystal recipe. Everything still looking good. Full mac today but i still need to adjust my oven temp because it seem alittle hot in oven some are crack but still a good mac. When it too cold my macaron isnt as smooth.

Hello! I’m new here! I want to learn how to bake macaron that are not hollow.