Taste buds born and raised on the bayou will know right away that chef James O'Donnell has spent most of his chefdom in Vegas, not in Louisiana. But most mouths that arrive at Sunday's Gospel Brunch extravaganza aren't here for fine fried catfish or seasoned collard greens; they're here for the hour that follows the extensive Cajun buffet--the gospel performance. Whether you're seated at the 10 a.m. or 1 p.m. show (call in advance--reserved seating only), make sure you digest that cornbread quickly--the entertainers only wait about five minutes before asking the audience to stand and clap along. A word to the shy: if you show you've got the spirit, you'll be asked to sing solo.