Drain crabmeat, removing any bits of shell.
Combine crushed crackers and next 7 ingredients; gently fold crabmeat into mixture. Shape into 8 thin patties.
Melt butter in a skillet over medium heat. Add crab cakes; cook, in batches, 4 to 5 minutes on each side or until golden. Drain on paper towels. Garnish, if desired. Serve crab cakes with Caper Sauce.