Preheat oven to 425°F
Roast the veggies: Toss carrots, peppers, squash, zucchini, and broccoli with avocado oil, garlic powder, salt, and pepper. Spread on a baking sheet and roast for 20 minutes until tender and lightly browned.
Cook the pasta: Meanwhile, cook rotini according to package directions. Drain, rinse with cool water, and set aside.
Mix the dressing: In a large bowl, whisk together mayo and spicy mustard.
Combine: Add roasted veggies and cooked pasta to the bowl. Toss everything until coated.
Serve warm or chilled. Add extra salt, pepper, or a drizzle of avocado oil if desired.