Preheat oven to 425°F (220°C). Toss cauliflower florets with 2 tablespoons olive oil and a pinch of salt. Spread on a baking sheet and roast for 30 minutes, stirring occasionally, until nicely browned and tender.
While cauliflower roasts, blend the 3/4 cup cashews, 3/4 cup water, 1 teaspoon salt, 1 jar pasta sauce, and 1 jar drained roasted red peppers in a blender until completely smooth and creamy. This creates the luscious sauce!
Cook 1 pound whole wheat penne pasta according to package directions until al dente.
Drain the pasta and toss it with a generous amount of the creamy red pepper sauce. Use as much sauce as you like; leftovers are great too!
Add most of the roasted cauliflower to the pasta and sauce mixture, tossing gently to combine.
Serve the pasta topped with the reserved roasted cauliflower florets and a garnish of fresh greens for a beautiful finish.