In a large sauepan, melt butter. Stir in the flour, salt, paprika and nutmeg until smooth. Gradually add cream. Bring to a boil; cook and stir for 2 minutes or until thickened. Reduce heat. Add process cheese and lemon juice; stir until the cheese is melted. Remove from the heat and add cheddar cheese; stir until melted. Stir in crab.
Transfer to a greased 1-qt. baking dish. Sprinkle with additional paprika if desired.
Bake, uncovered, at 350F for 20-25 minutes or until bubbly.