These Mexican-style fold-overs with an Italian spin are brimming with provolone and mozzarella cheeses as well as ripe olives and walnuts.
Preheat oven to 350 degrees F. Stack tortillas and wrap in foil. Bake about 10 minutes or until softened. Meanwhile, in a medium bowl, combine mozzarella cheese, provolone cheese, olives, nuts, and the 2 teaspoons snipped oregano or 1/2 teaspoon dried oregano. Spread cheese mixture onto half of each tortilla. Fold tortillas in half; secure with wooden toothpicks. Brush one side of each quesadilla with some of the oil.
In a large skillet or on a griddle, place quesadillas, 2 or 3 at a time, oiled sides down; cook over medium heat about 4 minutes or until heated through, brushing with remaining oil and turning once. Cut each quesadilla in half.
Meanwhile, in a small saucepan, heat salsa just until hot; stir in the 1 teaspoon snipped oregano or 1/4 teaspoon dried oregano. If desired, garnish with oregano sprigs. Serve with quesadillas.