Preheat oven to 400. Prepare 2 parchment lined baking sheets. To one, transfer broccoli florets and drizzle with olive oil. Roast for 20-30 minutes or until lightly browned and crispy. To another, transfer bell peppers, onion, garlic, olive oil, and a pinch of salt and pepper. Roast for 20 minutes.
Cook pasta according to package instructions. Conserve 1 cup pasta water, drain, and set aside.
Add cashews, 1/2 cup reserved pasta water, tomato paste and arrowroot starch to high powered blender or food processor. Blend until smooth. Next, add roasted vegetables, nutritional yeast, Black pepper, salt, red pepper flakes, salt, oregano, smoked paprika. To achieve desired consistency, slowly add remaining pasta water or discard if you prefer your sauce thick. Sauce can also be thinned using vegetable broth or unsweetened plain nut milk
To a large pot on the stove, combine pasta, broccoli, creamy red pepper sauce, and most of the basil. Taste and season with salt and pepper if needed. Serve topped with basil, red pepper flakes, and nutritional yeast or vegan parmesan. Enjoy!