how long to cook picnic ham in slow cooker
1 Spread about 1 1/2 cups of brown sugar on the bottom off the slow cooker crock. 2  Place the ham flat side down into slow cooker. 3  Rub remaining brown sugar onto top of ham. 4  Cover, and cook on Low for 6-8 hours. mixed dry mustard in with the brown sugar(less than a cup for my 10 pound ham) and sprinkled some in the bottom of the slow cooker but used most of it to rub into the top and sides of the ham. I got a late start so I started it on high for 2 hours and then turned it to low for 3 hours.