Melt the butter in the bottom of a Dutch oven on medium high heat.
Add the chopped onions to the melted butter and continue cooking on medium high heat until the onions are glazed or just about clear.
Add in the soups and the crabmeat and stir well.
Pour milk into the empty soup cans and then into the Dutch oven, stir well. I fill each soup can twice, scraping the sides with a spoon to get all of the soup. (The amount of milk you use will depend on your personal preference as to how thick you want your stew)
Add in the Old Bay and stir well.
Because this is a milk base stew, you will need to stir often.
Continue cooking on medium high heat until the stew reaches a soft boil.
Turn down and simmer for about 30 minutes, stirring often.
Serve and enjoy!