Preheat oven to 450°F (230°C). Line a baking pan with parchment paper.

Combine cauliflower florets, diced red and green bell peppers, olive oil, taco seasoning, minced garlic, salt, and pepper in a large bowl. Toss well to ensure everything is evenly coated.

Spread the seasoned vegetables in a single layer on the prepared baking pan. Roast for 10 minutes, then stir and roast for an additional 5-7 minutes, or until the cauliflower is tender and slightly charred.

While the vegetables are roasting, warm the flour tortillas according to package directions (e.g., in a dry skillet, microwave, or oven).

Once the cauliflower is roasted, remove the pan from the oven. Toss the roasted vegetables with fresh lime juice and chopped cilantro. Serve immediately in the warm tortillas, adding your favorite taco toppings.