Preheat the oven to 400 degrees F. Line a large rimmed baking sheet with parchment paper. Then place the cut Brussels sprouts and French beans on top.
Drizzle 3 tablespoons olive oil over the top of the veggies, then sprinkle with Old El Paso Taco Seasoning. Toss to coat and spread out evenly in a single layer.
Roast in the oven for 20-25 minutes, until the Brussels sprouts are cooked but firm. Then sprinkle cheese over the top and place back in the oven for 2-3 minutes to melt the cheese. Once out of the oven, sprinkle fresh chopped green onions over the top and serve immediately.