
Preheat oven to 400°F.
Smear the butter all over the bottom of a 2-quart baking dish.
Slice potatoes, then cut the slices into fourths.
In a medium bowl, whisk together cream, milk, flour, garlic, salt, and plenty of pepper.
Place a third of the potatoes in the bottom of the baking dish. Pour a third of the cream mixture over the potatoes. Repeat this 2 more times, ending with the cream mixture. Cover with foil and bake for 30 minutes. Remove the foil and bake for 20 minutes, or until the potatoes are golden brown and really bubbling. Add the cheese to the top of the potatoes and bake until the cheese is melted and bubbly, 3 to 5 minutes more.
Allow to stand for a few minutes before serving by the spoonful. Delicious!