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Preheat the oven to 400°F and lightly spray a shallow baking dish with cooking spray.
Melt the butter and stir in the olive oil and garlic. Set aside.
Thinly slice the potatoes using a mandoline or food processor. Arrange the slices vertically and pour over the butter mixture. Generously season with salt and pepper and place a few sprigs of thyme over top.
Place the dish on a baking tray and cover loosely with foil. Bake for 60 minutes or until golden brown and crispy on the edges.
Scrub the russet potatoes. Depending on the size of your potato, cut your each one into 6-10 similar sized chunks. In a large bowl, toss your potatoes and onions with the olive oil, butter, salt and pepper and if you have some reserved bacon grease, throw that in as well. If you make the bacon after you pop the potatoes in, add the drippings to them after you do so. Scrape the potato mixture into a baking dish where the potatoes are not overcrowded and roast for 25-30 minutes.
After 20 minutes, gently toss them around. After 25-30 minutes, gently toss them around and see if they are tender and crispy. If so remove from the oven. If not, continue roasting until they are.