This easy side dish is made in one pan and is surprisingly complexly flavoured. Don't rush browning the mushrooms - this is the basis for the deep flavour of the finished dish.
Add 2 tbsp of olive oil to a large skillet for which you have a lid. Set over medium-high heat. Once shimmering, add the mushrooms along with a generous pinch of salt. Cook, stirring occasionally, until the mushrooms release all of their moisture and are deeply golden brown - about 7-10 minutes.
Add the garlic and chili flakes. Cook until very fragrant, about 30 seconds. Pour over the wine and cook for a minute or two longer, just unti the strong alcoholic smell has gone away.
Add the kale along with 2 tbsp of water, a pinch of salt and a generous grind of black pepper. Stir to combine with the mushrooms and cover with a lid. Allow the kale to cook until it's wilted, tender and reduced in size - about 2 more minutes. Taste to adjust for seasoning and serve immediately.