Chock-full of crab and topped with chunks of rustic bread, this irresistible spread is substantial and hearty. Offer a knife for slathering it onto cut vegetables.
Preheat oven to 375 degrees. Mash cream cheese in a bowl until very soft. Add cheddar and 1/2 cup mayonnaise and stir to combine. Stir in crab, pimiento, scallions, lemon juice, salt, and hot sauce to taste. Spoon mixture into two 14-ounce baking dishes, dividing evenly.
Stir together torn bread and remaining 2 tablespoons mayonnaise. Top spread with bread mixture, dividing evenly. Bake on a baking sheet until golden brown and bubbling, about 25 minutes. Serve immediately with vegetables.