Biscotti Substitution

mandlebrot
or
amaretti
can be substituted for biscotti.

Amaretti Substitution

almond biscotti
or
ladyfingers
or
graham cracker crumbs
or 
macaroons (These are softer than amaretti)
can be substituted for amaretti.

Shortbread Substitution

butter cookie (crisper)
can be substituted for shortbread.  

Macaroon Substitution

amaretti (These aren’t as soft as macaroons.) 
can be substituted for macroons.

Butter Cookie Substitution

shortbread (not as crisp)
can be substituted for butter cookies.