Cauliflower Fried "Rice" with Leftover Ham

leftover ham, diced

medium head (about 24 oz) cauliflower

sesame oil

large eggs, beaten

cooking spray

small onion, diced fine

frozen peas and carrots

garlic cloves, minced

scallions, whites and greens separated, sliced on angle

soy sauce, or more to taste (use Tamari for Gluten Free)