Drain the tuna well and flake it with a fork.
Add the softened cream cheese and mayonnaise to a mixing bowl. Stir until smooth and creamy.
Add the tuna, lemon juice, garlic powder, Old Bay seasoning, chopped green onions, salt, and black pepper.
Stir until everything is evenly combined and the dip looks creamy.
Taste and adjust the seasoning with more lemon juice, black pepper, or Old Bay if desired.
Cover and chill for 20–30 minutes for the best flavor.
Transfer to a serving bowl and serve with crackers, pretzel sticks, pretzels, sliced cucumbers, and lemon wedges.