Super tasty, crispy, cheesy bacon-y potatoes. This potato bake with bacon, otherwise known as boulangere potatoes, is the perfect ‘posh’ side for serving with your meat and vegetables main. You’ll find them a little lighter than a typical creamy potato gratin, but they’re just as delicious and easy to make!
Now slowly cook the onions in the butter in same pan you cooked the bacon in until they start to go golden and sticky (about 15 to 20 minutes). Stir from time to time (but not too much). Just before the end of the cooking time, add a splash of balsamic vinegar and let cook for a minute or two more.
While waiting for the oven to heat up, layer up your potato bake like a lasagna. Spray your baking dish with oil (a medium sized dish - I used the equivalent of a 12 x 9 inch dish). Cover the bottom of the dish with about ¼ of the potato slices. Sprinkle with 1/3 of the onions, 1/3 of the bacon, and ¼ of the parmesan. Sprinkle over a large pinch of herbs, and plenty of black pepper.
Place the dish on a baking sheet, then carefully pour over the broth/stock until it barely covers the potatoes.
Dot the top of the potato bake all over with butter, then bake for 1 hour to 1 hour and a quarter or until your potato bake is nicely browned on top and bubbling, most of the broth/stock has been absorbed, and the potatoes are tender.
Let stand for 20 minutes to let more of the broth/stock be absorbed. Sprinkle with a little chopped fresh parsley if you like before serving.
DO NOT wash or soak your potatoes after peeling. This will wash all the starch away, which is essential for thickening up the juices in your potato casserole.
You may find the results vary a little according to which type of potatoes you use in your potato bake. The best potatoes to use are really starchy ones that will thicken up the juices as the casserole bakes, but sometimes it’s hard to know which kind of potatoes are starchier!
If you don’t know, don’t worry. You may end up with slightly runnier ‘juice’ in your casserole, but that’s OK. These potatoes will still be absolutely delicious!
This potato bake can be made ahead and refrigerated and/or frozen until you want to eat it. Make and cool completely, then either store in the fridge for a day or two or wrap well and freeze.
When you want to serve your potatoes, simply defrost completely (if frozen!) and reheat for 30 minutes at 355F/200C.