Prepare mashed potatoes following package directions, set aside to cool.
Preheat oven to 300 degrees F.
In a large bowl, combine egg, green onions, red bell pepper, parsley, mustard, and seasonings.
Add crab meat and mix well.
Blend in cooled potatoes until well distributed.
Shape into 2-inch wide patties. Press panko breading onto both sides of each patty. In a large skillet, heat 1 teaspoon each of the butter and oil over medium heat.
Add patties and cook for about 4 minutes on each side until golden and heated through.
Transfer crab cakes to a baking sheet. Keep warm in oven.
Repeat with the remaining butter, oil and patties.
To make lemon aioli, combine all ingredients and mix well. Cover and chill. Can be made a day ahead.
Serve warm on a bed of watercress with Lemon Aioli.
**Instead of 16 oz. cooked crab meat, you can substitute three 6 oz cans lump crabmeat, drained and cartilage removed.
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