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Take your dough out of the fridge and let it sit on the counter for 1 hour before baking. At the same time, preheat Baking Steel at 500F.
Heat a large skillet over medium heat. Add olive oil and garlic. Cook the garlic for 1 minute to flavor the oil, add spinach and cook for 2-3 minutes until wilted. Squeeze the water out of the spinach in a tea towel and set aside. You don't have to go crazy and squeeze the life out of it, you just want to get rid of most of the liquid.
In a small bowl, stir together the marinara sauce and oregano, if using.
When ready to put your pizza together, turn the oven up to 525F. On a pizza peel lightly dusted with flour, stretch the dough into an ~ 10 inch circle and spread on the sauce, leaving about a 1 inch border. Add the mozzarella cheese and bake for 6-7 minutes until the cheese is just beginning to brown. Remove from the oven, add the spinach and feta and cook for ~ 2 minutes more.