Chicken Broccoli and Sweet Potato Sheet Pan Dinner

sweet potatoes peeled and diced into 3/4-inch cubes ((2 medium, about 3 cups))

olive oil (, divided)

lbs boneless skinless chicken breasts (, diced into pieces (about 1 1/4-inches, keep them close to the same size so they all cook even))

small broccoli florets

of a medium red onion (, diced into chunks)

garlic (, minced)

each dried thyme (, sage, parsley and rosemary)

nutmeg

Salt and freshly ground black pepper

pecans (, whole or roughly chopped)

dried cranberries