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Start by placing softened cream cheese and mayonnaise into the slow cooker bowl.
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Stir in grated Parmesan, shredded cheddar, chopped onion, garlic, Worcestershire, hot sauce, and seasonings until roughly combined.
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Fold in the crab gently so you keep lumps intact. Set the slow cooker to low and heat for 1 to 1.5 hours, stirring every 20–30 minutes.
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The dip is ready when cheeses melt and the mixture is smooth and hot throughout.
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If you need the dip sooner, use the high setting for 30–45 minutes but watch closely and stir more often to prevent scorching. Serve warm with crackers, toasted baguette slices, or vegetable sticks.