Make the crab dip

• In a bowl, mix the softened cream cheese, mayonnaise and sour cream until smooth.
• Fold in the crab meat, half of the cheddar, the parmesan, sliced green onion, lemon juice, Old Bay and black pepper.

Toast the bagels

• Split the bagels in half and brush the cut sides with melted butter.
• Toast them cut-side up until lightly golden.

Assemble and melt

• Spoon the crab dip generously onto the toasted bagel halves.
• Top with the remaining cheddar.
• Bake or broil until the cheese is melted and bubbling.

Serve

• Finish with extra sliced green onion and a pinch of Old Bay.
• Serve hot.