Prep: preheat oven to 450 degrees Fahrenheit. Cook pasta in accordance with package directions.
Add chopped broccoli, peppers, and onion in a bowl, mix with olive oil, lime juice, and ½ tsp of salt. Place coated vegetables on a baking sheet and roast vegetables for about 30 minutes, flipping them around 15-minute mark.
Blend avocado, lime juice, garlic, and ½ tsp of salt together until reaching a sauce-like consistency.
In a large bowl, combine pasta, roasted vegetables, and sauce. Mix everything.
Top with cherry tomatoes, cilantro stems, and salt and pepper before serving.