Cook the kale. Bring a large pot of water to a boil. Add 1 tsp Kosher salt, then the torn kale leaves. Cook for 5 minutes, until tender and bright green. Use tongs or a slotted spoon to transfer the kale to a blender or food processor, reserving the cooking water.
Blend the kale sauce. Add ½ cup of the reserved kale cooking water, ¼ cup walnuts, 2 Tbsp extra virgin olive oil, 1 tsp Kosher salt, and ¼ tsp black pepper to the blender. Blend until completely smooth and silky. If needed, add 1–2 Tbsp additional olive oil to loosen the sauce. Set aside.
Crisp the pancetta. Heat a skillet over medium-high heat. Add 5 oz cubed pancetta and cook for 3–5 minutes (depending on cube size), until golden brown and lightly crispy. Transfer to a paper towel–lined plate to drain.
Cook the gnocchi. Bring the kale cooking water back to a rapid boil. Add the gnocchi and cook according to package directions. Reserve ½ cup of the cooking liquid, then drain.
Bring it all together. In a large skillet, heat 1 Tbsp butter and 1 Tbsp olive oil. Add garlic and red pepper flakes; cook for 30 seconds, just until fragrant. Add the drained gnocchi and let sit undisturbed for about 1 minute to develop light golden edges before stirring. Pour in the kale sauce, mascarpone, grated Pecorino, and ¼ cup reserved cooking water. Stir to coat evenly. Add more reserved water as needed for a looser, silkier sauce. Return the crispy pancetta to the pan and toss once more to combine.
Finish and serve. Divide among bowls and top with extra grated Pecorino, crushed walnuts, a drizzle of high-quality finishing olive oil, and a tiny pinch of flaky sea salt, if desired. Serve immediately while warm and creamy.