Preheat oven to 450 degrees.
Scrub potatoes and prick them with a fork
Place in the microwave and cook on high until just fork tender, approximately 8 - 15 minutes, depending on the size of the potatoes and your microwave.
While the potatoes are in the microwave, melt the butter. Add oil, garlic, onion, and pepper to the butter and stir well.
Remove potatoes from microwave and thinly slice.
Place potatoes in a baking dish and drizzle the butter mixture over potatoes.
Place in the oven and bake at 450 degrees for 10 - 15 minutes or until tops are browned and potatoes are very tender.
Sprinkle with parsley and serve.