Heat the olive oil in a large sauté pan over medium heat. Add the red onion, garlic, and chili flakes and cook, stirring often, until soft and slightly translucent on the edges, about 3 minutes. Add the chopped zucchini and season with salt and pepper. Sauté and stir often until zucchini is soft on the edges–about another 4-5 minutes.
Transfer the sautéed zucchini mixture to an upright blender. To the blender add the cashews, 2 of the roasted red peppers, nutritional yeast, miso, lemon juice, Dijon, tamari, smoked paprika, and vegetable stock, plus a little bit of salt and pepper. Blend the mixture on high until smooth and creamy, about 1 full minute. Add more stock by the tablespoon if necessary to get a thick but pourable consistency. Set aside.
Give the large sauté pan a wipe and place it back over high heat with a drizzle of olive oil. Cut the kernels off of the corn cobs and toss the kernels into the skillet. Sauté the corn until there’s a bit of char on the edges and the corn is soft, about 7-8 minutes. Season with salt and pepper and set aside.
Cook the pasta according to package directions and drain. Reserve about a cup of the pasta cooking water.
Slice the remaining roasted red pepper into strips. In the large skillet with the corn, also add the roasted red pepper strips, cooked pasta, red pepper sauce, and chopped basil. Set the heat to medium. Add splashes of pasta cooking water if needed to loosen up the sauce. Keep stirring until pasta is nice and hot. Serve immediately with extra basil, chili flakes, and finishing drizzles of olive oil.