Preheat oven to 400 degrees. Line a 12 x 17 baking sheet with parchment paper. (Can omit the parchment paper if you don't mind a little extra clean up.)
Spread chicken, zucchini, squash, carrots, bell pepper, and red onion on the prepared baking sheet.
Drizzle olive oil over everything on the baking sheet and sprinkle with Mediterranean Roasting Rub. Stir so everything is coated and then spread out all ingredients in a single layer.
Bake for 20 minutes, stirring once halfway through, until chicken is cooked and veggies are tender.
Top with any chopped fresh herbs you have. I like rosemary, parsley, and/or basil here. Serve!