Combine navy beans, lemon juice, olive oil, garlic, and chile flakes in a blender. Blend until smooth and set aside.
Heat 2 tablespoons of butter in a large skillet over medium high heat. Add mushrooms and cook until golden brown, about 9 minutes. Transfer mushrooms to a bowl.
Melt remaining tablespoon of butter in the skillet. Add kale and season with salt and pepper. Cook, stirring frequently, until wilted, about 3 minutes. Remove from heat. Add mushrooms back to the skillet and toss to combine.
Divide bean mixture between 2 serving plates. Top with mushroom and kale mixture.
Mushroom and Kale Stir-Fry over Navy Beans · Dinner Match Lab | Dinner Match Lab