Cut potatoes into quarters (or smaller if you prefer)
Place potatoes in slow cooker
Add chicken broth to potatoes
Add minced garlic to potatoes
Add parmesan cheese to potatoes
Sprinkle onion powder over potatoes
Sprinkle black pepper over potatoes
Cook on low for 6 hours
Reduce the slow cooker temperature to warm
When the potatoes are done, add sour cream to the potatoes
Add milk to the potatoes
Mash the potatoes (right in the slow cooker)
When the rest of the meal is ready, serve the potatoes directly from the slow cooker