Preheat the oven to 200 degrees and line a baking sheet with parchment paper. Rinse the half zucchini and half bell pepper. Remove the seeds from the pepper and cut both vegetables into equal, bite-sized pieces of about two centimeters.
Spread the cut zucchini and bell pepper in a single layer over the baking sheet. Slide the baking sheet into the middle of the oven and roast the vegetables for twenty minutes until cooked. Stir the pieces halfway through cooking so they cook evenly.
Remove the roasted vegetables from the oven and let them cool for a few minutes. Meanwhile, place the mixed greens in a large bowl. Add the warm zucchini and bell pepper to the greens, pour the tablespoon of olive oil over, and toss well.
Divide the dressed salad onto a flat plate or shallow bowl. Scoop the two tablespoons of hummus in the center on top of the vegetables. Serve immediately.