Spray slow cooker bowl with non stick oil spray.
Layer 1/3 of potato slices in bottom of bowl.Add half of onion and half of bacon. Layer 1/3 of potato slices on top.Add remaining half of onion and bacon.Layer remaining potato.
In a bowl stir milk, cream, garlic and salt and pepper to combine. Pour over potatoes.
Cover and cook on HIGH for 2hrs then LOW for 2-3hrs depending on your cooker.(Auto function for 5hrs will achieve the same result)
Half an hour prior to serving top with grated cheese and cook until melted.
*Notes*- Every slow cooker is different. If you worry your potato bake is getting too dry you can add further milk/cream or even just milk. It will all still come together by the end.
This is the perfect sized potato bake for the 1.5L baby slow cookers
The extra sauce in picture was just something I added at the time for extra flavour - totally optional - some people like a squirt of mustard also