Preheat oven to 375 degrees F.Advertisement
Heat tortillas until warm (see Tips). Coat each side of 4 tortillas with cooking spray. (Keep the remaining 4 tortillas covered.) Turn a 12-cup muffin tin upside down. Nestle a tortilla in the space between 4 cups to form a "bowl." Repeat with 3 more tortillas, making 4 bowls total. Bake until firm and beginning to brown, about 15 minutes. Transfer to a wire rack to cool. Repeat with the remaining 4 tortillas.
Equipment: Muffin tin with 12 (1/2-cup) cups
Warming tortillas prevents them from cracking and breaking. Here are three ways to warm your tortillas:
In the oven: Wrap stacks of 8 tortillas in foil; place in a 375°F oven for 10 to 15 minutes.
On the stove: Turn a gas or electric burner on high. Using tongs, slide one tortilla at a time over the burner for a few seconds, alternating sides, until it's softened and beginning to char. Cover tortillas to keep warm.
In the microwave: Wrap a stack of 8 tortillas in a barely damp, clean kitchen towel (or paper towel); microwave on High for 30 to 45 seconds.