Make sure bell pepper, zucchini, and red onion are all chopped to roughly the same size for even cooking.
Combine veggies with olive oil, salt, ground chipotle pepper, cumin, garlic powder and pepper.
Preheat grill to medium high heat. Place grill basket directly onto the grill so it can preheat too.
If you don't have a grill basket, spray a large sheet of aluminum foil with nonstick cooking spray and spread veggies on top in a single layer. Otherwise, spread veggies directly onto grill basket.
Cook veggies on the grill for 5-7 minutes, stirring often, until veggies are softened and slightly charred.
Remove veggies from the grill (if using foil, I like to slide it off the grill directly onto a sheet pan).
To serve, fill tortillas with grilled veggies and top with avocado, cheese, cilantro, and a squeeze of lime juice.