Melt butter over medium heat in a large pan. Add onion, celery and bell pepper and cook until soft. Remove from heat and let cool.
Pick through the crab to remove any pieces of shell and place crab in a large bowl.
Add remaining ingredients to bowl along with cooked onion, peppers, and celery. Gently mix it all together.
Pack mixture into crab shells. You can order tin crab shells online. You will need about 10.Sprinkle with a little paprika if desired.
Bake in a 350 degree oven for 20 minutes.
Notes
If you want to make this recipe spicy, add a pinch or two of cayenne pepper or serve with hot sauce.Leftover deviled crab can be stored in an airtight container in the refrigerator for 2 to 3 days.