Meanwhile, cut potatoes and mix in a large bowl with rosemary, garlic, salt, black pepper, and parsley.
Once bacon is done and crispy, remove to a plate to cool.
With remaining bacon fat in the pan (approximately ¼ cup), turn heat to medium. Make sure to watch the pan, as it can get smoky.
Once it's good and hot, you will carefully add the seasoned potatoes.
The pan will likely spit and hiss (or otherwise have a "hissy fit"), so stay back while adding the potatoes. It will settle down pretty quickly.
Once the hissy fit subsides, you can stir the potatoes around with a spatula to evenly coat them with the bacon fat.
Preheat oven to 350.
Cook potatoes for 10 minutes while oven is heating up, stirring often. Crumble the bacon and add to the potatoes, stirring in.
Bake for 15-20 minutes or until desired brownness.