Wash and dry potatoes. Leave the peel on the potatoes and slice them thinly.
Arrange potatoes in a lightly greased baking casserole dish.
Once the potatoes are nestled together in the dish, randomly tuck the thinly sliced garlic cloves in between the potato slices. Do the same with the oregano leaves.
Drizzle olive oil over potatoes, being sure to brush in between slices.
Add small pats of butter on top of the potatoes.
Season potatoes generously with salt and pepper.
Bake for 60 minutes or until potatoes are golden brown and tender.