Heat a medium skillet with extra-virgin olive oil and butter over medium to medium-high heat. When fat is hot, add garlic and mushrooms and place a lid which is too small for the skillet down into the pan, pressing and smothering the mushrooms. Cook 7-8 minutes, stirring once, then wilt the kale into the pan, turning it with tongs to combine with mushrooms. Smother the greens for 1 to 2 minutes, then deglaze the pan with Marsala annd season the mixture with salt and pepper, to taste.