Preheat oven to 400 degrees. Spray and 11 X 7 X 2 " baking dish.
Blend milk, cream, goat cheese, garlic and spices together in a blender or food processor.
Arrange ⅓ of potato slices in bottom of the dish in a single layer but slightly overlapping. Pour ⅓ of milk mixture over. Repeat 2 more times.
Bake uncovered until potatoes are tender and top is golden brown - about 60-75 minutes. After 30 minutes check if the top crust is brown. Lay a sheet of foil or parchment paper loosely over the top so they don't over-brown on top. Test for doneness after 60 minutes.