Preheat oven to 400 degrees. Invert 4 small ovenproof bowls or ramekins on a rimmed baking sheet and lightly coat with cooking spray. Coat both sides of 4 tortillas with cooking spray and drape tortillas over bowls. Bake until golden and crisp, 12 minutes, checking after 5 minutes to make sure tortillas are centered on bowls (if they slide off, put them back on bowls). Repeat with 4 more tortillas.Advertisement
Store tortilla cups at room temperature in an airtight container, up to 1 day.