Combine the crab and shrimp in a medium bowl.
In a large bowl combine the crackers, mayonnaise, onion, celery, jalapeno, mustard, pepper, Creole mustard, Creole seasoning, onion, and garlic powder.
Fold in the crab and shrimp.
Form into 6 5 1/2 ounce patties. For appetizers, make 2-3 ounce patties.
Wrap cakes in plastic wrap and refrigerate 30 minutes to 1 hour.
Melt butter in a large skillet over medium heat. Add the olive oil.
Once the oil is hot, working in batches add the patties and brown for about 4-5 minutes per side until golden brown. Remove to a paper towel-lined plate or rack to cool and drain.
Serve with your favorite dipping sauce. We prefer a nice Cajun remoulade!