Make the dough. Combine all dough ingredients in a medium bowl and transfer to the counter to knead for 5 minutes until the dough is a smooth ball. Place back in bowl and cover for 4 hours. Either use immediately or place in the fridge until ready to use.
Pre-heat oven to 500 degrees. On a floured surface, divide the dough into two and roll to desired size and thickness. Transfer to cast iron pans.
In a small bowl, mash together goat cheese and garlic and probably a splash of water to make the mixture spreadable. Spread evenly on pizza dough. Slice onions into half moons and arrange in a pretty design on the pizza. Bake for approx 15 minutes until dough is browned and cooked.
Remove pizza from oven and immediately add spinach to wilt. In a separate bowl, toss your microgreens salad with a splash of olive oil, white balsamic, salt and pepper. Add the salad to the pizza just a few minutes out of the oven. Sprinkle with chili flakes and salt. Enjoy immediately.