Heat oven to 400˚ Toss cauliflower florets with canola oil, garlic, salt, pepper, and onion powder. Place on a baking sheet and roast for 25 minutes or until they are tender and slightly charred. Remove from oven and set aside.
Heat up oven to 500˚ Place pizza stone in oven to heat up.
On lightly floured surface, roll and stretch out dough into long rectangle that is approximately ¼- ½ inch thick.
Take out pizza stone from oven and spread cornmeal out where dough will lay. Gently transfer dough to pizza stone and back for 5-7 minutes or until dough is crispy yet still slightly doughy.
Remove pizza stone and dough from oven, spread ricotta leaving ¼- ½ inch of space for crust.
Over top of ricotta, distribute cauliflower, tomatoes, goat cheese, and chickpeas.
Bake for 10 more minutes, then add arugula to flatbread.
Continue to bake until crust is golden brown. Finish with olive oil and course black pepper.