se almond flour, NOT almond meal (that stuff you can get at Trader Joe’s). This is a game changer and is absolutely necessary to make smooth, delicate shells. It’s not quite as easy to find, but it’s 100% worth the extra bit of effort.
Use baker’s sugar(you can find it at Safeway). If you use normal white sugar, granules may not melt and can cause cracks by drawing heat to themselves.
Grind almond flour and powdered sugar together, then sift through a fine mesh sieve to make sure there aren’t any lumps. If you grind the almond flour alone, it will turn into almond butter.
Add powdered egg whites (not meringue powder). It helps make a sturdier batter that will hold up better.