Preheat oven to 400°F and line a baking sheet with parchment paper.
Bring a large pot of water to a boil. Add potatoes and boil for 8 minutes.
Drain the potatoes well using a colander.
In the same pot, melt butter and olive oil together.
Return the potatoes to the pot, then add garlic salt and black pepper. Toss until evenly coated.
Arrange potatoes skin side up on the prepared baking sheet.
Bake for 30–40 minutes, or until the Crispy Oven Baked Potato Bites are golden and crisp.