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In a separate bowl, whisk the egg and then add in the mayonnaise until combined. Add the crushed saltines, stir, let it sit for 1 minute. Add remaining ingredients (except butter). Shape into 5 patties on a well-greased baking sheet (no parchment, it will burn). Cover with plastic and allow to sit for 30 min - 1 hour. Remove plastic, lay the slices of butter on top, and back for 12-15 minutes or until golden brown. If it is getting too dark, place the cakes at a lower level rack in the oven. The cakes are done when they are golden brown and the eggs are set.
