Preheat the oven to 450F or 425F convection. Line a baking sheet with parchment paper.
Add broccoli, mushrooms, and beans to the baking sheet. Drizzle with oil, cumin, chili, and salt and use your hands to toss to coat. Spread out into an even layer and bake for 15-20 minutes, or until veggies are cooked through and beginning to crisp.
Carefully use the parchment to transfer the broccoli/beans to a bowl, then return the parchment to the baking sheet. Drizzle the baking sheet with a bit more oil (optional) and place the tortillas on top. Top each tortilla evenly with cheese, then scatter the veggie/bean mixture over the cheese.
Bake for 7-9 more minutes, or until cheese is melted and tortillas are beginning to crisp on the edges.
In a high-speed blender, add all of the sauce ingredients and blend on high until smooth.
In a medium bowl, add the slaw veggies and toss with ¼ cup of the sauce above.
Top each taco directly on the sheet pan or on your plate with slaw, sauce, more cilantro, and a squeeze of lime.