Preheat grill or grill pan over medium-high heat.
Brush zucchini, bell pepper, and onion slices with olive oil. Season with salt, pepper, and oregano.
Grill vegetables for 3-4 minutes per side until tender and lightly charred.
Warm the tortilla on the grill for about 30 seconds per side.
Spread hummus on the tortilla.
Layer grilled vegetables and spinach on top of the hummus.
Sprinkle with feta cheese if using.
Roll the wrap tightly, tucking in the sides as you go.
Cut in half and serve