<human>: How do you do this: How can I cleanly make crisp fat free flour taco shells?

OPTIONS:
- Place flour tortillas into the spaces between the bottom of an inverted muffin,  spray with cooking oil (like pam) first, bake at 400 degrees for 15 min.
- Place flour tortillas into the spaces between the bottom of an inverted muffin tin, spray with cooking oil (like pam) first, bake at 400 degrees for 15 min.
<bot>: Place flour tortillas into the spaces between the bottom of an inverted muffin tin, spray with cooking oil (like pam) first, bake at 400 degrees for 15 min.