preheat oven 350'f halve peppers lengthwise;scoop out seed and membranes,leaving stems intact. in large saucepan.cook peppers in boiling water for 3 min;drain.rinse pepper with cold running water until cool;drain again.
for filling in a small skillet,cook celery,green onion,garlic, and Cajun seasoning in hot oil for 3 min,stirring often.remove from heat.in a med bowl,combine sausage,cooked rice ,cheese,bread crumbs,parsley,and cooked celery mixture.
spoon filling into pepper halves.press filling firmly into peppers. place place peppers in a 15x10x1-inch baking pan.
bake uncover about 20 min or until heated through and cheese melts. makes 24 to 28 appetizers.