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Adjust racks to middle and bottom positions and preheat oven to 450 degrees. Wash and dry produce.
Thinly slice tomato into rounds. Halve, core, and thinly slice bell pepper into strips.
Trim and slice mushrooms into 1⁄4-inch- thick pieces (skip if your mushrooms are
pre-sliced!). Trim and halve yellow squash crosswise; slice one half into 1⁄4-inch-thick rounds and dice remaining half into 1⁄4-inch pieces. Drain and rinse beans. TIP: Prep any additional toppings, if using.