Easy Roasted Vegetable Wrap

Name: Easy Roasted Vegetable Wrap
Ingredients: 2 portobello mushrooms, gills removed and cut into slices; 1 red bell pepper, thinly sliced; ½ red onion, thinly sliced; 1 small zucchini, cut into thin spears; 1 tablespoon olive oil; ¼ teaspoon kosher salt, or to taste; ¼ teaspoon coarse ground black pepper, or to taste; ¼ cup pesto ((see my recipe for homemade basil pesto)); ¼ cup mayonnaise; 4 large wraps; ¼ cup crumbled feta cheese ((I use reduced-fat)); a few handfuls of fresh baby spinach