Ooh, I love sheet pan chicken recipes. Yes, it should work, but you would want to buy chicken legs or bone-in chicken thighs to use, because chicken breasts would dry out in the oven in the time it would take to cook the potatoes and cauliflower. Double the spice mixture, add some olive oil, and toss everything together (don't parboil the vegetables). Lay it all out in a rimmed baking pan and cook in a 425°F oven for about 40 to 45 minutes until the chicken reaches that magical number (165°F) and the vegetables are fork-tender.