Preheat oven to 400° F. Heat oil in large skillet on medium-high. Add shrimp peppers green onions and OLD BAY. Cook and stir 4 to 5 minutes or until shrimp turn pink.
Place 3 tortillas on baking sheet. Spread with shrimp mixture. Sprinkle with cheese then top with second tortilla.
Bake 5 minutes or just until cheese melts. Cut each quesadilla into 4 wedges. Serve warm with avocado slices and sour cream, if desired.