Combine the potatoes, olive oil, garlic, and kosher salt in a 6-quart slow cooker, stirring until evenly coated.
Cover and cook on high for 3 to 4 hours or on low for 5 to 6 hours, until the potatoes reach fork tenderness. Refrain from uncovering during cooking.
Once done, uncover, stir, and taste. Adjust seasoning with additional salt or olive oil as desired.
Serve immediately, garnishing with fresh herbs and a sprinkle of flaked sea salt if using. Enjoy warm.