Pick through crab meat to remove any cartilage or shells. Set aside.: Start by spreading the crab meat on a clean surface and gently feel for any hard bits, which can be surprising when you bite into the dip. The texture should be tender and slightly springy, and the aroma mild with a hint of the sea. Removing shells avoids crunch in the finished dip, and keeping the lumps intact offers satisfying bites. A common mistake is rushing this step, which can leave shell fragments in the mix, so take your time and use good lighting.
Stir together cream cheese, chopped artichoke hearts, mayonnaise or sour cream, lemon juice, Worcestershire sauce, hot sauce, garlic, dry mustard, cheeses, and 1/2 of the green onions. Carefully fold in the crab meat, taking care not to break apart all of the large pieces of crab meat.: As you combine these elements, the cream cheese should give a soft, spreadable base that pulls together the other ingredients into a cohesive batter. You will notice the tang from the lemon juice and the warm, savory perfume from the garlic and Worcestershire sauce . Folding is about preserving texture, so use gentle strokes to maintain lump crab meat integrity; the visual contrast of white crab against the cheesy mix is part of the experience. Overmixing is a frequent misstep, which can turn distinct chunks into an indistinct paste, so stop folding once the mix is uniform but still chunky.
Line a slow cooker with a Reynolds Slow Cooker Liner or lightly spray with nonstick cooking spray.: Preparing the slow cooker reduces cleanup and prevents sticking so the edges can brown slightly without losing the whole batch to the crock. The interior should be lightly slick to the touch, and the smell of any previous meals should be absent so the dip tastes clean. Skipping a liner or spray can result in sticking that makes serving messy, so take a moment to prep the pot.
Transfer the crab mixture to the slow cooker, cover and cook on high setting for 180 minutes or low setting for 360 minutes.: When the mixture hits heat, the aroma will change from sharp to mellow as cheeses melt and garlic softens, producing a warm, savory steam. You should see a gentle shimmer on the surface as fats release, and occasional small bubbles at the edges when it is properly warmed through. Cooking low and slow helps flavors meld without overcooking the crab , while high is fine when time is tighter. A classic error is to open the lid frequently which lets heat escape and lengthens cook time, so resist peeking unless you need to stir very gently.
Top the cooked crab dip with 6 roughly crushed butter crackers or about 1/4 cup of broken toasted bagel pieces. Top with remaining green onions and serve with crackers or bagels.: The final plating introduces contrast, with the crushed butter crackers providing a nutty, salty crunch against the warm, creamy interior. The aroma will be fuller now, with the sharpness of melted Cheddar cheese and the toasted notes from the crackers. Garnish with the reserved green onions for color and a fresh bite. Avoid adding the crunchy topping too early, as it will lose crispness if it sits in the warm crock for long periods.