Preheat the oven to 350°F and grease a medium glass baking dish.
Peel potatoes and slice thinly. Slice Spam thinly.
Place half of the potatoes in the bottom of the dish. Then, place half of the meat on top.
Add remaining potatoes and meat, then pour the milk over top.
Bake, covered with aluminum foil, for 1 hour.
Remove foil and bake for another 20-30 minutes, or until potatoes are fork-tender and starting to brown.
Allow to sit for 10 minutes before serving.
*Nutritional information is a calculated guesstimate. Please note that this can change with different brands and modifications you may make to the recipe. For the most accurate information, use a nutritional calculator with the exact brands and measurements you're using with each recipe.