Slice the zucchini, bell pepper, onion, and mushrooms into even pieces and toss them lightly with olive oil, salt, and black pepper.
Heat a grill pan (or outdoor grill) over medium-high and cook the vegetables for 3–5 minutes per side, until tender with light char.
Warm the whole-grain tortilla in a dry skillet for 10–15 seconds per side to make it flexible and easier to roll.
Spread 3–4 tablespoons of hummus in a strip down the center of the tortilla.
Layer the grilled vegetables over the hummus, letting excess steam escape before adding them.
Add a handful of spinach or romaine on top for freshness and structure.
Fold the sides inward, then roll the wrap tightly from the bottom up.
Optional: Press the wrap in a warm skillet for 30 seconds per side to lightly toast and seal it.