Cook pasta in salted water until al dente. Reserve 1 cup cooking water.
Meanwhile, heat EVOO in a large pan over medium heat. Add the cherry tomatoes and thyme leaves. Cover and cook for about 7 minutes or until the tomatoes start to soften and burst. You can press them with the back of a wooden spoon to help them burst once they soften.
Mix in the sliced zucchini and corn to the pan. Season to taste with Kosher salt and pepper. Cook for about 3 minutes, stirring every so often, until the zucchini is softened.
Add garlic and red pepper flakes; cook 1 minute, then stir in lemon juice.
Lower the heat. Transfer the cooked pasta to the vegetables. Mix in the mascarpone cheese. Add about ½ a cup of the reserved hot pasta water or more as needed to form a creamy sauce. Season with Kosher salt and black pepper to taste.
Serve topped with Parmesan, extra lemon juice, and zest if desired.
Notes
Serving Suggestions: I served this with Crispy Parmesan Chicken. This recipe would also pair well with shrimp, lobster, grilled chicken, or really any protein of your choosing! You can also omit a protein and serve as is.
Storage & Reheating: Store leftovers in an airtight container in the fridge for up to 3 days. Reheat gently on the stovetop or in the microwave. Add a splash of water or broth to loosen the sauce if needed.