Add all ingredients except cheese to a slow cooker. Whisk to prevent grits from sticking on bottom of pan. Cook on high 2 -2 1/2 hours. Stir a couple of time during the cooking process. When grits thicken and liquid is almost all absorbed, stir in the cheese. Cook another 15 to 20 minutes to allow cheese to melt.
Grits should be smooth and creamy. Add more heavy cream if necessary if they get too thick.
You can also stir in more salt and butter if needed