Preheat your oven to 400°F (200°C). Prepare a baking sheet with parchment paper.
Spread the halved potatoes, sliced carrots, chopped yellow squash, and zucchini on the baking sheet. Drizzle with olive oil and season with salt, pepper, oregano, and minced garlic. Toss to coat all the veggies evenly. If the potatoes are thick, cut them into quarters for quicker roasting.
Roast the vegetables for 25-30 minutes, until they turn golden brown.
For the chimichurri dressing, combine cilantro, parsley, garlic, salt, pepper, olive oil, lime juice, and red wine vinegar in a food processor. Blend until the mixture is smooth.
In a large bowl, place a generous handful of mixed salad greens. Add the roasted veggies and sliced radishes on top.
Drizzle the chimichurri dressing over the salad and toss to combine.