Creamy Potato Kale Gratin Recipe By Tasty

Steps:

• Set the slow cooker to the sauté function. Add the oil and, once hot, add the leek and cook for 1-2 minutes, then add the kale and continue cooking for another 2-3 minutes, or until the leek is soft. Gently scoop into a bowl. Line the slow cooker with a sheet of baking paper, working carefully as it will be hot.
• Add the cream, stock and cheeses to a bowl and use a fork to combine.
• Arrange one-third of the potato slices over the bottom of the lined bowl, overlapping them slightly. Pour in one-third of the cream mixture and sprinkle with one-third of the leek mixture. Season and repeat the process until all the ingredients have been used.
• You should get three decent layers of cheesy potato goodness. Close the lid and cook on high for 4 hours.
• Check the liquid at the 3-hour mark. If there is a lot of liquid remaining, leave the lid off for the last hour of cooking. If, at 4 hours, there is still too much liquid, remove the lid and, if your cooker has it, hit the reduce function, or simply the sauté function, and cook for 2-5 minutes. This will quickly get rid of any excess moisture.
• Allow to cool for at least 15 minutes in the slow cooker before gently removing. If you try to cut it when still hot, it tends to go everywhere. Alternatively, scoop the gratin straight from the bowl onto the plate. It might not look amazing, but it's the kind of dish that is here for a good time, not a long time.
• Season generously with salt and pepper and serve. Eat wearing stretchy pants; you are going to need them.

Steps:

• Arrange a rack in center of oven; preheat to 350ºF. Arrange bread slices on a rimmed baking sheet and bake, flipping once halfway through, until dry and lightly toasted, 15-20 minutes. Let cool. Transfer to a resealable plastic bag and break into irregular, 1/2"-1" pieces. Transfer to a medium bowl; set aside.
• Meanwhile, wash and spin-dry kale, then layer between paper towels or a large clean kitchen towel and pat dry.
• Mix Gruyère and Parmesan in a medium bowl. Shingle one-quarter of potatoes in 3 or 4 rows, slightly overlapping, in bottom of baking dish. Sprinkle with one-quarter of thyme, 1/4 tsp. salt, and 1/8 tsp. pepper. Top with 2 cups kale and one-quarter of cheese mixture. Repeat 2 more times. Shingle remaining potatoes over cheese; top with 1/4 tsp. salt, 1/8 tsp. pepper, and remaining thyme. Reserve remaining kale and cheese.
• Stir cream, garlic, 1/4 tsp. salt, and 1/8 tsp. pepper in a liquid measuring cup. Pour evenly over potatoes.
• Bake gratin 40 minutes. Cover with foil and continue to bake until cream is bubbling and thick and potatoes are tender when pierced with a paring knife, 35-45 minutes more.
• Meanwhile, toss reserved croutons with 2 Tbsp. oil in a medium bowl. Toss remaining kale with remaining 1 Tbsp. oil. Top gratin with kale, remaining cheese, then croutons, allowing kale pieces to peek through. Bake gratin until croutons are golden brown and exposed kale edges are well-crisped, about 15 minutes more. Let cool at least 10 minutes before serving.
• Do Ahead
• Bread can be toasted 3 days ahead. Store in an airtight container at room temperature. Kale can be torn, washed, and patted dry 3 days ahead. Wrap in paper towels, place in a resealable plastic bag, and chill.
• Gratin can be made 1 day ahead. Let cool, then wrap tightly in plastic and chill. Bring to room temperature, cover with foil, and warm in a 300ºF oven until heated through, 15-20 minutes. Uncover and continue to warm to re-crisp croutons and exposed kale edges, about 5 minutes.