Can I use aluminum foil as a substitute for parchment paper?
Depends on what you're making. The principal differences are:


Parchment is much more non-stick than aluminum foil. I haven't tried non-stick aluminum myself, so no idea how that compares.
Parchment insulates (against heat transfer) more than aluminum.
Parchment is somewhat porous; it absorbs water.


Looking at that recipe quickly, it'd probably work fine. I'd suggest substituting aluminum foil sprayed with Pam (non-stick cooking spray). The bottom may brown a little quicker with the foil.