Using a 2-in. round cookie cutter, cut 12 circles from each tortilla. Coat both sides of circles with cooking spray. Place in a single layer on a baking sheet. Bake at 400° for 4-5 minutes or until crisp. Cool.

In a small bowl, combine the sour cream, 1 teaspoon cilantro, onions and garlic powder; cover and refrigerate. In another bowl, combine the corn, tomato, jalapeno, orange juice, oil, salt and remaining cilantro; cover and refrigerate. Just before serving, spread 1 teaspoon sour cream mixture over each tostada. Using a slotted spoon, top each with a teaspoonful of corn salsa.

Editor's Note: Wear disposable gloves when cutting hot peppers; the oils can burn skin. Avoid touching your face.