Melt the butter in a medium pan over medium-low heat. Add the onion, garlic, and salt. Cook for 12-15 minutes, until the onions are caramelized. Remove from heat and transfer to a small bowl to cool completely.
Using a fine-mesh strainer, drain crab meat over a bowl.
In a medium bowl, combine the cream cheese, sour cream, mayonnaise, Worcestershire, hot sauce, Old Bay, and lemon juice. Using an electric mixer, beat together until well combined. With a flexible spatula, fold in the onion mixture, ¾ cup (75 grams) cheddar cheese, and the crab meat.
Transfer the dip to a 1-quart baking dish. Top evenly with the remaining cheddar cheese.
Bake for 20-25 minutes, until the mixture is just beginning to bubble around the edges and the cheese is melted.
Heat the broiler to low. Broil dip for 3 minutes, until the whole surface is bubbling and browned. Remove the dip from the oven. Let cool for at least 15 minutes, until set.
Garnish the dip with Old Bay and chives. Serve with carrot sticks, celery sticks, crackers, and crostini.
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These meals will make your weeknights way simpler. (And tastier!)