Caramelize the onions in a frying pan.
Place shrimp on skewers. Sprinkle with seasoning salt. Grill until pink on high heat (do not overcook).
Roughly chop shrimp.
Assemble quesadillas by spreading half of a tortilla with cream cheese. Add shrimp, onion, pepper and grated cheese.
Fold quesadilla in half. Brush with oil and grill on medium heat about 4 mins. per side. Serve with guacamole, sour cream and salsa.